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Drivetrain & Sports Gearbox Parts


Optimize Your Drivetrain: More Power, More Pleasure

At Optimiz Access, we offer custom-tailored solutions for a more efficient, direct, and responsive drivetrain. Whether you are aiming to put power down on the track or achieve sharper gear selection in daily driving, upgrading your transmission system unlocks the full potential of your sports vehicle.

Key benefits of an optimized drivetrain: faster and more precise gear shifts for dynamic driving, improved torque distribution for maximum traction, enhanced component reliability, and custom setups suited to all driving styles.

Essential Components for Gearboxes and Differentials

Our lineup brings together all the essential precision parts needed to maximize power transfer to the road:

  • Clutches & Flywheels – Reinforced clutch kits, single-mass race flywheels, and high-friction materials built to handle high torque output.
  • LSDs & Differentials – Limited-slip differentials designed to eliminate wheelspin and maximize exit traction.
  • Shifters & Short Shifters – Precision short-throw shifters delivering crisp, rapid gear engagements.
  • Final Drive Gears – Shorter ring and pinion gear sets providing explosive acceleration and mid-range response.
  • Gearbox Oils & Bearings – High-performance synthetic gear oils and heavy-duty bearings engineered to protect gears under load.

Benchmark Brands and Trusted Partners

We work with the most respected motorsport manufacturers in the industry: CAE Racing, Sadev, Quaife, 4Tech Shifter, Helix, SACHS Performance, and TTV Racing. We also stock OEM factory parts to cover all your routine maintenance, servicing, and drivetrain overhauls.

Why Choose Optimiz Access for Your Drivetrain?

Since 2010, Optimiz Access has specialized in the custom upgrading and maintenance of sports and premium vehicles. By relying on us, you gain expert technical advice, high-precision components, and professional installation in our workshop in northern France (Hauts-de-France) — near Lille, Valenciennes, Cambrai, Arras, Seclin, Douai, and Saint-Quentin. We ensure strict quality control along with fast worldwide shipping.

Gear Up and Boost Your Sports Car's Traction Today

Don't let your engine's power go to waste. Trust the expertise of Optimiz Access, select your transmission hardware today, and take advantage of our fast dispatch to get your vehicle build underway.

Active filters

  • Categories: Clutches and flywheels
  • Categories: Drive Shafts
  • Categories: Short Bridge
SADEV 12-Tooth Secondary Shaft (7711129468) - Renault Clio 2 Gr N ST66 GearboxSADEV 12-Tooth Secondary Shaft (7711129468) - Renault Clio 2 Gr N ST66 Gearbox
      The SADEV 12-Tooth Secondary Shaft (7711129468 / F19030201) is a core component of your SADEV ST66 gearbox. This original SADEV part ensures the vital connection to the differential via the 58-tooth crown wheel for the specific 12x58 final drive . The replacement of a damaged...
      €988.36Price
      SADEV 12-Tooth Secondary Shaft (7711129468) - Renault Clio 2 Gr N ST66 GearboxSADEV 12-Tooth Secondary Shaft (7711129468) - Renault Clio 2 Gr N ST66 Gearbox
          The SADEV 12-Tooth Secondary Shaft (7711129468 / F19030201) is a core component of your SADEV ST66 gearbox. This original SADEV part ensures the vital connection to the differential via the 58-tooth crown wheel for the specific 12x58 final drive . The replacement of a damaged...
          €988.36Price
          En Stock
          €1,145.76 Price
          En Stock
          €1,145.76 Price
          Left Evo reinforced driveshaft CV axle Renault Sport Megane N4 SADEV ref 7711167653
              Don't risk driveshaft failure or loss of traction during a rally stage or track day. The genuine Renault Sport / SADEV left evolved (Evo) driveshaft (Reference: 7711167653) is specifically engineered to handle high torque output and extreme mechanical stress on the...
              €1,145.76Price
              Left Evo reinforced driveshaft CV axle Renault Sport Megane N4 SADEV ref 7711167653
                  Don't risk driveshaft failure or loss of traction during a rally stage or track day. The genuine Renault Sport / SADEV left evolved (Evo) driveshaft (Reference: 7711167653) is specifically engineered to handle high torque output and extreme mechanical stress on the...
                  €1,145.76Price
                  En Stock
                  €16.52 Price
                  En Stock
                  €16.52 Price
                  Collier soufflet sur tulipe diam 93.5 Clio Gr N
                      Collier soufflet sur tulipe diam 93.5 Clio Gr N Référence: 77 11 156 805
                      €16.52Price
                      Collier soufflet sur tulipe diam 93.5 Clio Gr N
                          Collier soufflet sur tulipe diam 93.5 Clio Gr N Référence: 77 11 156 805
                          €16.52Price
                          Couronne 58 dents ( 12 / 58 ) équipée Clio Gr NSADEV 58x12 Crown Wheel - Renault Sport Clio 2 Gr.N ST66
                              Do not risk a mechanical failure and retirement during your next stage. This 56-tooth crown wheel for 12-tooth shafts is an official Renault Sport competition part, engineered by the experts at SADEV for the Renault Clio 2 Group N equipped with the ST66 gearbox . As the exclusive distributor ...
                              €758.77Price
                              Couronne 58 dents ( 12 / 58 ) équipée Clio Gr NSADEV 58x12 Crown Wheel - Renault Sport Clio 2 Gr.N ST66
                                  Do not risk a mechanical failure and retirement during your next stage. This 56-tooth crown wheel for 12-tooth shafts is an official Renault Sport competition part, engineered by the experts at SADEV for the Renault Clio 2 Group N equipped with the ST66 gearbox . As the exclusive distributor ...
                                  €758.77Price
                                  En Stock
                                  €898.58 Price
                                  En Stock
                                  €898.58 Price
                                  Couronne 63 dents ( 12 / 63 ) équipée Clio Gr NCouronne 63 dents ( 12 / 63 ) équipée Clio Gr N
                                      Couronne 63 dents ( 12 / 63 ) équipée Clio Gr N Référence: F19030231
                                      €898.58Price
                                      Couronne 63 dents ( 12 / 63 ) équipée Clio Gr NCouronne 63 dents ( 12 / 63 ) équipée Clio Gr N
                                          Couronne 63 dents ( 12 / 63 ) équipée Clio Gr N Référence: F19030231
                                          €898.58Price
                                          En Stock
                                          €1.75 Price
                                          En Stock
                                          €1.75 Price
                                          Anneau d'arret transmission circlips Twingo R2
                                              Anneau d'arret transmission circlips Twingo R2 Référence: 7711167345
                                              €1.75Price
                                              Anneau d'arret transmission circlips Twingo R2
                                                  Anneau d'arret transmission circlips Twingo R2 Référence: 7711167345
                                                  €1.75Price
                                                  Arbre secondaire 12 dents (pour couronne 63 dts) Clio Gr N
                                                      Arbre secondaire 12 dents (pour couronne 63 dts) Clio Gr N 7711129473
                                                      €1,017.37Price
                                                      Arbre secondaire 12 dents (pour couronne 63 dts) Clio Gr N
                                                          Arbre secondaire 12 dents (pour couronne 63 dts) Clio Gr N 7711129473
                                                          €1,017.37Price
                                                          Vis CHC M8x20 CL 10.9 Brut Clio Gr NSADEV M8x20 CHC Bolt - Renault Clio 2 Gr.N ST66 Gearbox
                                                              Do not risk an oil leak or a complete transmission failure due to neglected hardware. This M8x20 CHC bolt (Grade 10.9, raw finish) is an official Renault Sport component, manufactured by SADEV . Specifically designed for securing the differential cover on the ST66 gearbox of the Renault Clio 2...
                                                              €0.79Price
                                                              Vis CHC M8x20 CL 10.9 Brut Clio Gr NSADEV M8x20 CHC Bolt - Renault Clio 2 Gr.N ST66 Gearbox
                                                                  Do not risk an oil leak or a complete transmission failure due to neglected hardware. This M8x20 CHC bolt (Grade 10.9, raw finish) is an official Renault Sport component, manufactured by SADEV . Specifically designed for securing the differential cover on the ST66 gearbox of the Renault Clio 2...
                                                                  €0.79Price
                                                                  Collection de soufflet de cardan gauche coté boite Clio 2 RS Phase 2 et 3
                                                                      Collection de soufflet de cardan gauche coté boite Clio 2 RS
                                                                      €86.59Price
                                                                      Collection de soufflet de cardan gauche coté boite Clio 2 RS Phase 2 et 3
                                                                          Collection de soufflet de cardan gauche coté boite Clio 2 RS
                                                                          €86.59Price
                                                                          En Stock
                                                                          €370.03 Price
                                                                          En Stock
                                                                          €370.03 Price
                                                                          Pochette revision changement de couple Clio R3Pochette revision changement de couple Clio R3
                                                                              Pochette revision changement de couple Clio R3 Référence: 7711163710
                                                                              €370.03Price
                                                                              Pochette revision changement de couple Clio R3Pochette revision changement de couple Clio R3
                                                                                  Pochette revision changement de couple Clio R3 Référence: 7711163710
                                                                                  €370.03Price
                                                                                  Left-hand inner CV boot repair kit (gearbox side) for Renault Megane 3 RS and Megane N4 rally cars.
                                                                                      Do not risk a catastrophic transmission fluid leak, sudden failure of your left-hand inner CV joint tripod, or the highly expensive replacement of a complete genuine Renault Sport driveshaft assembly. The Kit soufflet de transmission cardan gauche coté boite Megane 3 RS et...
                                                                                      €85.96Price
                                                                                      Left-hand inner CV boot repair kit (gearbox side) for Renault Megane 3 RS and Megane N4 rally cars.
                                                                                          Do not risk a catastrophic transmission fluid leak, sudden failure of your left-hand inner CV joint tripod, or the highly expensive replacement of a complete genuine Renault Sport driveshaft assembly. The Kit soufflet de transmission cardan gauche coté boite Megane 3 RS et...
                                                                                          €85.96Price
                                                                                          En Stock
                                                                                          €1,901.64 Price
                                                                                          En Stock
                                                                                          €1,901.64 Price
                                                                                          Transmission gauche assemblée Clio R3 MaxiRenault Sport Left Drive Shaft for Clio R3 Max
                                                                                              Do not let a mechanical failure compromise your next rally. This assembled left-hand drive shaft is an official Renault Sport component (reference 7711168126 ), specifically developed for the Renault Clio R3 Max . Engineered to withstand the extreme constraints of a competition-grade F4R engine, this left CV...
                                                                                              €1,901.64Price
                                                                                              Transmission gauche assemblée Clio R3 MaxiRenault Sport Left Drive Shaft for Clio R3 Max
                                                                                                  Do not let a mechanical failure compromise your next rally. This assembled left-hand drive shaft is an official Renault Sport component (reference 7711168126 ), specifically developed for the Renault Clio R3 Max . Engineered to withstand the extreme constraints of a competition-grade F4R engine, this left CV...
                                                                                                  €1,901.64Price
                                                                                                  En Stock
                                                                                                  €1,594.54 Price
                                                                                                  En Stock
                                                                                                  €1,594.54 Price
                                                                                                  Transmission droite assemblée Clio R3 MaxiRenault Sport Right Drive Shaft for Clio R3 Max
                                                                                                      Maintain the traction and balance of your front axle with this complete right-hand drive shaft , an original Renault Sport component (reference 7711168127 ). Specifically calibrated for the high-stress environment of the Renault Clio R3 Max , this CV axle ensures absolute reliability during full-throttle gear changes. Do not...
                                                                                                      €1,594.54Price
                                                                                                      Transmission droite assemblée Clio R3 MaxiRenault Sport Right Drive Shaft for Clio R3 Max
                                                                                                          Maintain the traction and balance of your front axle with this complete right-hand drive shaft , an original Renault Sport component (reference 7711168127 ). Specifically calibrated for the high-stress environment of the Renault Clio R3 Max , this CV axle ensures absolute reliability during full-throttle gear changes. Do not...
                                                                                                          €1,594.54Price
                                                                                                          Collection soufflet de transmission gauche coté boite Clio 3 RS - Megane 2 RS
                                                                                                              Collection soufflet de transmission gauche coté boite Clio 3 RS et Megane 2 RS Véritable produit d'origine
                                                                                                              €108.19Price
                                                                                                              Collection soufflet de transmission gauche coté boite Clio 3 RS - Megane 2 RS
                                                                                                                  Collection soufflet de transmission gauche coté boite Clio 3 RS et Megane 2 RS Véritable produit d'origine
                                                                                                                  €108.19Price
                                                                                                                  Bol de Roue Clio 2 Cup et Williams Gr A
                                                                                                                      The SADEV Wheel Housing (Hub Carrier) (references 7700108002 , 7711155366 , 1008025 ) is an essential part for ensuring the fastening and reliability of the driveshaft at the wheel end on your competition vehicle . It is used notably on the Renault Clio 2 X65 Cup equipped with the SADEV...
                                                                                                                      €130.96Price
                                                                                                                      Bol de Roue Clio 2 Cup et Williams Gr A
                                                                                                                          The SADEV Wheel Housing (Hub Carrier) (references 7700108002 , 7711155366 , 1008025 ) is an essential part for ensuring the fastening and reliability of the driveshaft at the wheel end on your competition vehicle . It is used notably on the Renault Clio 2 X65 Cup equipped with the SADEV...
                                                                                                                          €130.96Price
                                                                                                                          En Stock
                                                                                                                          €248.51 Price
                                                                                                                          En Stock
                                                                                                                          €248.51 Price
                                                                                                                          Genuine Renault Sport Clio 3 X85 Cup front race wheel bowl part 7711160118 F1908361.
                                                                                                                              Do not risk imprecise steering, severe track vibrations, or drivetrain failure on your running gear. The genuine wheel bowl for Renault Clio 3 X85 Cup (OEM references 7711160118 and F1908361 ) is the fundamental link component of the...
                                                                                                                              €248.51Price
                                                                                                                              Genuine Renault Sport Clio 3 X85 Cup front race wheel bowl part 7711160118 F1908361.
                                                                                                                                  Do not risk imprecise steering, severe track vibrations, or drivetrain failure on your running gear. The genuine wheel bowl for Renault Clio 3 X85 Cup (OEM references 7711160118 and F1908361 ) is the fundamental link component of the...
                                                                                                                                  €248.51Price
                                                                                                                                  En Stock
                                                                                                                                  €102.54 Price
                                                                                                                                  En Stock
                                                                                                                                  €102.54 Price
                                                                                                                                  Kit soufflet de palier de Cardan Clio 2 RS
                                                                                                                                      Kit soufflet de palier de Cardan Clio 2 RS Attention, plusieurs modeles existent, merci de verifier la compatibilité avec votre cardan
                                                                                                                                      €102.54Price
                                                                                                                                      Kit soufflet de palier de Cardan Clio 2 RS
                                                                                                                                          Kit soufflet de palier de Cardan Clio 2 RS Attention, plusieurs modeles existent, merci de verifier la compatibilité avec votre cardan
                                                                                                                                          €102.54Price
                                                                                                                                          En Stock
                                                                                                                                          €65.56 Price
                                                                                                                                          En Stock
                                                                                                                                          €65.56 Price
                                                                                                                                          Collection soufflet Megane 3 RS coté roueCollection soufflet Megane 3 RS coté roue
                                                                                                                                              Collection soufflet Megane 3 RS coté roue Véritable produit d'origine
                                                                                                                                              €65.56Price
                                                                                                                                              Collection soufflet Megane 3 RS coté roueCollection soufflet Megane 3 RS coté roue
                                                                                                                                                  Collection soufflet Megane 3 RS coté roue Véritable produit d'origine
                                                                                                                                                  €65.56Price
                                                                                                                                                  Sur commande ou en cours de réappro
                                                                                                                                                  €196.99 Price
                                                                                                                                                  Sur commande ou en cours de réappro
                                                                                                                                                  €196.99 Price
                                                                                                                                                      Do not risk premature clutch failure in competition . Without a SADEV clutch guide tube (Ref. F0073019 ) in perfect condition, you lose the precise guidance necessary for the clutch release bearing , leading to a risk of slipping or blocking on your Clio 2 X65...
                                                                                                                                                      €196.99Price
                                                                                                                                                          Do not risk premature clutch failure in competition . Without a SADEV clutch guide tube (Ref. F0073019 ) in perfect condition, you lose the precise guidance necessary for the clutch release bearing , leading to a risk of slipping or blocking on your Clio 2 X65...
                                                                                                                                                          €196.99Price
                                                                                                                                                          Sur commande ou en cours de réappro
                                                                                                                                                          €94.79 Price
                                                                                                                                                          Sur commande ou en cours de réappro
                                                                                                                                                          €94.79 Price
                                                                                                                                                          Genuine Renault Clutch Cable - Clio WilliamsGenuine Renault Clutch Cable - Clio Williams
                                                                                                                                                              Restore precise and smooth clutch engagement on your legendary Renault Clio Williams with this genuine Renault clutch cable . Essential for fluid gear changes and the longevity of your gearbox, this cable guarantees reliability and pedal feel that meet factory standards. Don't let a stiff pedal or sloppy travel ruin your driving pleasure.
                                                                                                                                                              €94.79Price
                                                                                                                                                              Genuine Renault Clutch Cable - Clio WilliamsGenuine Renault Clutch Cable - Clio Williams
                                                                                                                                                                  Restore precise and smooth clutch engagement on your legendary Renault Clio Williams with this genuine Renault clutch cable . Essential for fluid gear changes and the longevity of your gearbox, this cable guarantees reliability and pedal feel that meet factory standards. Don't let a stiff pedal or sloppy travel ruin your driving pleasure.
                                                                                                                                                                  €94.79Price
                                                                                                                                                                  Sur commande ou en cours de réappro
                                                                                                                                                                  €60.64 Price
                                                                                                                                                                  Sur commande ou en cours de réappro
                                                                                                                                                                  €60.64 Price
                                                                                                                                                                  Renault Sport Clutch Bleed Hose - Megane N4Renault Sport Clutch Bleed Hose - Megane N4
                                                                                                                                                                      The Renault Sport Clutch Circuit Bleed Hydraulic Hose (ref. 7711167173) is an official RENAULT SPORT part designed for the Renault Megane N4 . It allows for easy and efficient bleeding of the clutch circuit, ensuring optimal performance. Optimiz Access is the official distributor of this part.
                                                                                                                                                                      €60.64Price
                                                                                                                                                                      Renault Sport Clutch Bleed Hose - Megane N4Renault Sport Clutch Bleed Hose - Megane N4
                                                                                                                                                                          The Renault Sport Clutch Circuit Bleed Hydraulic Hose (ref. 7711167173) is an official RENAULT SPORT part designed for the Renault Megane N4 . It allows for easy and efficient bleeding of the clutch circuit, ensuring optimal performance. Optimiz Access is the official distributor of this part.
                                                                                                                                                                          €60.64Price
                                                                                                                                                                          Sur commande ou en cours de réappro
                                                                                                                                                                          €187.96 Price
                                                                                                                                                                          Sur commande ou en cours de réappro
                                                                                                                                                                          €187.96 Price
                                                                                                                                                                          Renault Megane 3 RS Clutch Master Cylinder (Original)Renault Megane 3 RS Clutch Master Cylinder (Original)
                                                                                                                                                                              Original Renault Megane 3 RS Clutch Master Cylinder Original Renault part, for optimal performance of your Megane 3 RS. Discover complementary products at the bottom of the page for complete customization.
                                                                                                                                                                              €187.96Price
                                                                                                                                                                              Renault Megane 3 RS Clutch Master Cylinder (Original)Renault Megane 3 RS Clutch Master Cylinder (Original)
                                                                                                                                                                                  Original Renault Megane 3 RS Clutch Master Cylinder Original Renault part, for optimal performance of your Megane 3 RS. Discover complementary products at the bottom of the page for complete customization.
                                                                                                                                                                                  €187.96Price
                                                                                                                                                                                  Sur commande ou en cours de réappro
                                                                                                                                                                                  €331.39 Price
                                                                                                                                                                                  Sur commande ou en cours de réappro
                                                                                                                                                                                  €331.39 Price
                                                                                                                                                                                  Single-Mass Flywheel F4R - Clio 3 RSSingle-Mass Flywheel F4R - Clio 3 RS
                                                                                                                                                                                      Don't let a worn dual-mass flywheel harm the balance and responsiveness of your Clio 3 RS . This single-mass flywheel is the ideal technical solution to reliably secure your powertrain and improve your F4R engine's rev response. By keeping an original part that is often at its end-of-life on these generations,...
                                                                                                                                                                                      €331.39Price
                                                                                                                                                                                      Single-Mass Flywheel F4R - Clio 3 RSSingle-Mass Flywheel F4R - Clio 3 RS
                                                                                                                                                                                          Don't let a worn dual-mass flywheel harm the balance and responsiveness of your Clio 3 RS . This single-mass flywheel is the ideal technical solution to reliably secure your powertrain and improve your F4R engine's rev response. By keeping an original part that is often at its end-of-life on these generations,...
                                                                                                                                                                                          €331.39Price
                                                                                                                                                                                          Sur commande ou en cours de réappro
                                                                                                                                                                                          €1,542.64 Price
                                                                                                                                                                                          Sur commande ou en cours de réappro
                                                                                                                                                                                          €1,542.64 Price
                                                                                                                                                                                          Volant Moteur bi masse origine Megane 4 RS boite mécaVolant Moteur bi masse origine Megane 4 RS boite méca
                                                                                                                                                                                              Volant Moteur bi masse origine Megane 4 RS boite méca
                                                                                                                                                                                              €1,542.64Price
                                                                                                                                                                                              Volant Moteur bi masse origine Megane 4 RS boite mécaVolant Moteur bi masse origine Megane 4 RS boite méca
                                                                                                                                                                                                  Volant Moteur bi masse origine Megane 4 RS boite méca
                                                                                                                                                                                                  €1,542.64Price
                                                                                                                                                                                                  Sur commande ou en cours de réappro
                                                                                                                                                                                                  €51.83 Price
                                                                                                                                                                                                  Sur commande ou en cours de réappro
                                                                                                                                                                                                  €51.83 Price
                                                                                                                                                                                                  Support échangeur huile Bv Megane N4
                                                                                                                                                                                                      Support échangeur huile Bv Megane N4 Référence: 7711167051
                                                                                                                                                                                                      €51.83Price
                                                                                                                                                                                                      Support échangeur huile Bv Megane N4
                                                                                                                                                                                                          Support échangeur huile Bv Megane N4 Référence: 7711167051
                                                                                                                                                                                                          €51.83Price
                                                                                                                                                                                                          Sur commande ou en cours de réappro
                                                                                                                                                                                                          €453.52 Price
                                                                                                                                                                                                          Sur commande ou en cours de réappro
                                                                                                                                                                                                          €453.52 Price
                                                                                                                                                                                                          Mécanisme Embrayage Helix Clio 2 RS epaisseur 8mm
                                                                                                                                                                                                              Mécanisme Embrayage Helix Clio 2 RS
                                                                                                                                                                                                              €453.52Price
                                                                                                                                                                                                              Mécanisme Embrayage Helix Clio 2 RS epaisseur 8mm
                                                                                                                                                                                                                  Mécanisme Embrayage Helix Clio 2 RS
                                                                                                                                                                                                                  €453.52Price
                                                                                                                                                                                                                  Sur commande ou en cours de réappro
                                                                                                                                                                                                                  €548.00 Price
                                                                                                                                                                                                                  Sur commande ou en cours de réappro
                                                                                                                                                                                                                  €548.00 Price
                                                                                                                                                                                                                  Mecanisme Embrayage Helix Clio 3 RSHELIX MOTORSPORT Clutch Mechanism - Renault Clio 3 RS
                                                                                                                                                                                                                      Discover the HELIX MOTORSPORT clutch mechanism, designed specifically for the Renault Clio 3 RS . Optimize your vehicle's performance with increased power transmission and unwavering reliability. To complete your installation, explore our compatible clutch discs at the bottom of the page.
                                                                                                                                                                                                                      €548.00Price
                                                                                                                                                                                                                      Mecanisme Embrayage Helix Clio 3 RSHELIX MOTORSPORT Clutch Mechanism - Renault Clio 3 RS
                                                                                                                                                                                                                          Discover the HELIX MOTORSPORT clutch mechanism, designed specifically for the Renault Clio 3 RS . Optimize your vehicle's performance with increased power transmission and unwavering reliability. To complete your installation, explore our compatible clutch discs at the bottom of the page.
                                                                                                                                                                                                                          €548.00Price