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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.

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Original SADEV Clutch Release Bearing Support F1908252 - ST75 GearboxOriginal SADEV Clutch Release Bearing Support F1908252 - ST75 Gearbox
      The SADEV Clutch Release Bearing Support (references F1908252 and 0101908252 ) is an essential component for the reliable actuation of the clutch on your SADEV ST75 sequential gearbox . This genuine part is specifically designed for competition vehicles equipped with this transmission, including the Renault Clio 3 X85...
      €119.71Price
      Original SADEV Clutch Release Bearing Support F1908252 - ST75 GearboxOriginal SADEV Clutch Release Bearing Support F1908252 - ST75 Gearbox
          The SADEV Clutch Release Bearing Support (references F1908252 and 0101908252 ) is an essential component for the reliable actuation of the clutch on your SADEV ST75 sequential gearbox . This genuine part is specifically designed for competition vehicles equipped with this transmission, including the Renault Clio 3 X85...
          €119.71Price
          SADEV 15-Tooth Secondary Shaft (15/58) - ST75 Gearbox - Renault Clio 3 CupSADEV 15-Tooth Secondary Shaft (15/58) - ST75 Gearbox - Renault Clio 3 Cup
              The 15-Tooth Secondary Shaft is a fundamental component of the SADEV ST75 sequential transmission in your Renault Clio 3 X85 Cup . Specifically designed for the 15/58 final drive , this part ensures the correct gear reduction of your gearbox. Marketed under references F19080551 and 0119080551 ,...
              €928.99Price
              SADEV 15-Tooth Secondary Shaft (15/58) - ST75 Gearbox - Renault Clio 3 CupSADEV 15-Tooth Secondary Shaft (15/58) - ST75 Gearbox - Renault Clio 3 Cup
                  The 15-Tooth Secondary Shaft is a fundamental component of the SADEV ST75 sequential transmission in your Renault Clio 3 X85 Cup . Specifically designed for the 15/58 final drive , this part ensures the correct gear reduction of your gearbox. Marketed under references F19080551 and 0119080551 ,...
                  €928.99Price
                  SADEV ST75 Sequential Gearbox Input Shaft - Renault Clio 3 X85 CupSADEV ST75 Sequential Gearbox Input Shaft - Renault Clio 3 X85 Cup
                      Do not risk immobilizing your Renault Clio 3 X85 Cup ! This SADEV ST75 Sequential Gearbox Input Shaft is the essential part for maintaining the reliability and engagement of your transmission. Marketed under references F1908006 and 0101908006 , this shaft is a genuine SADEV part, a guarantee of quality and performance on the...
                      €736.39Price
                      SADEV ST75 Sequential Gearbox Input Shaft - Renault Clio 3 X85 CupSADEV ST75 Sequential Gearbox Input Shaft - Renault Clio 3 X85 Cup
                          Do not risk immobilizing your Renault Clio 3 X85 Cup ! This SADEV ST75 Sequential Gearbox Input Shaft is the essential part for maintaining the reliability and engagement of your transmission. Marketed under references F1908006 and 0101908006 , this shaft is a genuine SADEV part, a guarantee of quality and performance on the...
                          €736.39Price
                          En Stock
                          €1,389.05 Price
                          En Stock
                          €1,389.05 Price
                          Single-Mass Flywheel & 4-Pad Unsprung Clutch KitSingle-Mass Flywheel & 4-Pad Unsprung Clutch Kit
                              Unleash your sports vehicle's potential with our single-mass flywheel kit and its 4-pad unsprung clutch disc and pressure plate. Designed for direct power transmission and enhanced performance, this kit advantageously replaces your original flywheel and works perfectly with your **stock release bearing**. Ideal for sports use, it offers unprecedented...
                              €1,389.05Price
                              Single-Mass Flywheel & 4-Pad Unsprung Clutch KitSingle-Mass Flywheel & 4-Pad Unsprung Clutch Kit
                                  Unleash your sports vehicle's potential with our single-mass flywheel kit and its 4-pad unsprung clutch disc and pressure plate. Designed for direct power transmission and enhanced performance, this kit advantageously replaces your original flywheel and works perfectly with your **stock release bearing**. Ideal for sports use, it offers unprecedented...
                                  €1,389.05Price
                                  En Stock
                                  €2,140.86 €2,518.66 Regular price -15% off Price
                                  En Stock
                                  €2,140.86 €2,518.66 Regular price -15% off Price
                                  Renault Clio 4 RS Clutch Kit - Original PartRenault Clio 4 RS Clutch Kit - Original Part
                                      The original Renault clutch kit is specially designed for the Renault Clio 4 RS . Ensure the performance and reliability of your sports car with this complete kit, guaranteeing precise gear shifting and optimal transmission.
                                      €2,140.86€2,518.66Regular price-15% offPrice
                                      Renault Clio 4 RS Clutch Kit - Original PartRenault Clio 4 RS Clutch Kit - Original Part
                                          The original Renault clutch kit is specially designed for the Renault Clio 4 RS . Ensure the performance and reliability of your sports car with this complete kit, guaranteeing precise gear shifting and optimal transmission.
                                          €2,140.86€2,518.66Regular price-15% offPrice
                                          En Stock
                                          €18.07 Price
                                          En Stock
                                          €18.07 Price
                                          Motul DCTF High Torque Dual-Clutch Fluid 1LMotul DCTF High Torque Dual-Clutch Fluid 1L
                                              MOTUL DCTF HIGH TORQUE – DUAL-CLUTCH TRANSMISSION FLUID – 1 L Motul DCTF High Torque 1L is a transmission fluid developed for compatible dual-clutch transmissions (DCT) ...
                                              €18.07Price
                                              Motul DCTF High Torque Dual-Clutch Fluid 1LMotul DCTF High Torque Dual-Clutch Fluid 1L
                                                  MOTUL DCTF HIGH TORQUE – DUAL-CLUTCH TRANSMISSION FLUID – 1 L Motul DCTF High Torque 1L is a transmission fluid developed for compatible dual-clutch transmissions (DCT) ...
                                                  €18.07Price
                                                  Roulement à billes 6209 boite Twingo R2
                                                      Optimize your competition vehicle's transmission with this heavy-duty differential bearing (Reference 7711162230 ). Specifically engineered for demanding chassis setups, this genuine component ensures the reliability of the differential (right-hand output side) on the Renault Clio R3 ...
                                                      €42.43Price
                                                      Roulement à billes 6209 boite Twingo R2
                                                          Optimize your competition vehicle's transmission with this heavy-duty differential bearing (Reference 7711162230 ). Specifically engineered for demanding chassis setups, this genuine component ensures the reliability of the differential (right-hand output side) on the Renault Clio R3 ...
                                                          €42.43Price
                                                          En Stock
                                                          €41.18 Price
                                                          En Stock
                                                          €41.18 Price
                                                          Joint Spy jonction Cardan droit-Boite Megane 2 RSJoint Spy jonction Cardan droit-Boite Megane 2 RS
                                                              Joint Spy d'origine permettant l'etanchéité entre la boite et le cardan coté droit pour Megane 2 RS
                                                              €41.18Price
                                                              Joint Spy jonction Cardan droit-Boite Megane 2 RSJoint Spy jonction Cardan droit-Boite Megane 2 RS
                                                                  Joint Spy d'origine permettant l'etanchéité entre la boite et le cardan coté droit pour Megane 2 RS
                                                                  €41.18Price
                                                                  Vis CHC M8 x 20 cl 8.8 bichro pour boite crabot Clio 2 RS Gr NVis CHC M8 x 20 cl 8.8 bichro pour boite crabot Clio 2 RS Gr N
                                                                      Vis CHC M8 x 20 cl 8.8 bichro pour boite crabot Clio 2 RS Gr N Référence: 0301018
                                                                      €0.61Price
                                                                      Vis CHC M8 x 20 cl 8.8 bichro pour boite crabot Clio 2 RS Gr NVis CHC M8 x 20 cl 8.8 bichro pour boite crabot Clio 2 RS Gr N
                                                                          Vis CHC M8 x 20 cl 8.8 bichro pour boite crabot Clio 2 RS Gr N Référence: 0301018
                                                                          €0.61Price
                                                                          En Stock
                                                                          €26.60 Price
                                                                          En Stock
                                                                          €26.60 Price
                                                                          Cale de secondaire Clio Gr N
                                                                              Do not compromise the axial adjustment of your SADEV ST66 gearbox ! This countershaft shim (Ref. F1903028 ) is an essential SADEV brand part to ensure mounting...
                                                                              €26.60Price
                                                                              Cale de secondaire Clio Gr N
                                                                                  Do not compromise the axial adjustment of your SADEV ST66 gearbox ! This countershaft shim (Ref. F1903028 ) is an essential SADEV brand part to ensure mounting...
                                                                                  €26.60Price
                                                                                  Bague épaulée de 5ème Clio Gr N
                                                                                      Do not compromise the longevity of your SADEV ST66 gearbox ! This 5th gear stepped thrust washer (Ref. F1903015 ) is an essential SADEV brand part for managing axial...
                                                                                      €63.46Price
                                                                                      Bague épaulée de 5ème Clio Gr N
                                                                                          Do not compromise the longevity of your SADEV ST66 gearbox ! This 5th gear stepped thrust washer (Ref. F1903015 ) is an essential SADEV brand part for managing axial...
                                                                                          €63.46Price
                                                                                          En Stock
                                                                                          €526.61 Price
                                                                                          En Stock
                                                                                          €526.61 Price
                                                                                          Volant Moteur allégé Megane 2 RSVolant Moteur allégé Megane 2 RS
                                                                                              Volant Moteur allégé pour Megane 2 RS Convient pour l'embrayage d'origine ou tout autre embrayage renforcé compatible avec le volant moteur d'origine. Parfait en remplacement du Bimasse d'origine Poids: 5.7 Le remplacement d'un volant moteur bimasse par un monomasse peut engendrer des vibrations.
                                                                                              €526.61Price
                                                                                              Volant Moteur allégé Megane 2 RSVolant Moteur allégé Megane 2 RS
                                                                                                  Volant Moteur allégé pour Megane 2 RS Convient pour l'embrayage d'origine ou tout autre embrayage renforcé compatible avec le volant moteur d'origine. Parfait en remplacement du Bimasse d'origine Poids: 5.7 Le remplacement d'un volant moteur bimasse par un monomasse peut engendrer des vibrations.
                                                                                                  €526.61Price
                                                                                                  En Stock
                                                                                                  €181.39 Price
                                                                                                  En Stock
                                                                                                  €181.39 Price
                                                                                                  Câble de verrouillage MAR Lg 1560 mm Clio 2 Cup X65
                                                                                                      Câble de verrouillage MAR Lg 1560 mm Clio 2 Cup X65
                                                                                                      €181.39Price
                                                                                                      Câble de verrouillage MAR Lg 1560 mm Clio 2 Cup X65
                                                                                                          Câble de verrouillage MAR Lg 1560 mm Clio 2 Cup X65
                                                                                                          €181.39Price
                                                                                                          En Stock
                                                                                                          €10.02 Price
                                                                                                          En Stock
                                                                                                          €10.02 Price
                                                                                                          Bagues de liaison levier tringlerie Clio 2 RS
                                                                                                              Bagues de liaison levier tringlerie Clio 2 RS Livré sans l'écrou présent sur la photo
                                                                                                              €10.02Price
                                                                                                              Bagues de liaison levier tringlerie Clio 2 RS
                                                                                                                  Bagues de liaison levier tringlerie Clio 2 RS Livré sans l'écrou présent sur la photo
                                                                                                                  €10.02Price
                                                                                                                  En Stock
                                                                                                                  €596.11 Price
                                                                                                                  En Stock
                                                                                                                  €596.11 Price
                                                                                                                  Rapport de 3ème 18/28 Megane N4SADEV 3rd Gear Ratio 18/28 for Renault Mégane N4
                                                                                                                      Do not let a hesitant transmission ruin your stage performance. This genuine 3rd gear ratio (18/28) from the Renault Sport catalog is the key component to restoring the integrity of your SADEV dog-ring gearbox on the Mégane N4 . Engineered to withstand extreme mechanical stress, it prevents gear disengagement and protects...
                                                                                                                      €596.11Price
                                                                                                                      Rapport de 3ème 18/28 Megane N4SADEV 3rd Gear Ratio 18/28 for Renault Mégane N4
                                                                                                                          Do not let a hesitant transmission ruin your stage performance. This genuine 3rd gear ratio (18/28) from the Renault Sport catalog is the key component to restoring the integrity of your SADEV dog-ring gearbox on the Mégane N4 . Engineered to withstand extreme mechanical stress, it prevents gear disengagement and protects...
                                                                                                                          €596.11Price
                                                                                                                          Megane 3 RS Clutch Line – Stainless Steel Braided Hose
                                                                                                                              This HEL Performance braided clutch hose is specifically designed to replace the original hydraulic line on your Renault Mégane 3 RS. By eliminating the pressure accumulator, it provides a more direct clutch pedal response and increased reliability.
                                                                                                                              €56.64Price
                                                                                                                              Megane 3 RS Clutch Line – Stainless Steel Braided Hose
                                                                                                                                  This HEL Performance braided clutch hose is specifically designed to replace the original hydraulic line on your Renault Mégane 3 RS. By eliminating the pressure accumulator, it provides a more direct clutch pedal response and increased reliability.
                                                                                                                                  €56.64Price
                                                                                                                                  Butée sphérique sur fourchette pour cable renforcé Clio Gr n et X65 CupButée sphérique sur fourchette pour cable renforcé Clio Gr n et X65 Cup
                                                                                                                                      Butée sphérique sur fourchette pour cable renforcé Clio Gr n et X65 Cup
                                                                                                                                      €50.22Price
                                                                                                                                      Butée sphérique sur fourchette pour cable renforcé Clio Gr n et X65 CupButée sphérique sur fourchette pour cable renforcé Clio Gr n et X65 Cup
                                                                                                                                          Butée sphérique sur fourchette pour cable renforcé Clio Gr n et X65 Cup
                                                                                                                                          €50.22Price
                                                                                                                                          En Stock
                                                                                                                                          €706.79 Price
                                                                                                                                          En Stock
                                                                                                                                          €706.79 Price
                                                                                                                                          Rapport de 4ème 22/27 Megane N4SADEV 4th Gear Ratio 22/27 for Renault Mégane N4
                                                                                                                                              Optimize your transmission's precision with this genuine 4th gear ratio (22/27) from the Renault Sport catalog. Specifically engineered for the SADEV dog-ring gearbox used in the Mégane N4 , this official component ensures absolute reliability during high-speed gear changes in rallies or track days. Do not let a worn gear...
                                                                                                                                              €706.79Price
                                                                                                                                              Rapport de 4ème 22/27 Megane N4SADEV 4th Gear Ratio 22/27 for Renault Mégane N4
                                                                                                                                                  Optimize your transmission's precision with this genuine 4th gear ratio (22/27) from the Renault Sport catalog. Specifically engineered for the SADEV dog-ring gearbox used in the Mégane N4 , this official component ensures absolute reliability during high-speed gear changes in rallies or track days. Do not let a worn gear...
                                                                                                                                                  €706.79Price
                                                                                                                                                  RENAULT Speed Sensor Speedometer Drive - Clio 2 RS Phase 1RENAULT Speed Sensor Speedometer Drive - Clio 2 RS Phase 1
                                                                                                                                                      7700418919 RENAULT SPORT Speed Sensor (Speedometer Drive) – Essential Reliability Clio 2 RS P1 Do not risk speedometer failure or the loss of your engine data. This original RENAULT speed sensor is the essential component for the proper functioning of your Renault Clio...
                                                                                                                                                      €88.66Price
                                                                                                                                                      RENAULT Speed Sensor Speedometer Drive - Clio 2 RS Phase 1RENAULT Speed Sensor Speedometer Drive - Clio 2 RS Phase 1
                                                                                                                                                          7700418919 RENAULT SPORT Speed Sensor (Speedometer Drive) – Essential Reliability Clio 2 RS P1 Do not risk speedometer failure or the loss of your engine data. This original RENAULT speed sensor is the essential component for the proper functioning of your Renault Clio...
                                                                                                                                                          €88.66Price
                                                                                                                                                          Butée Embrayage (récepteur) d'origine Megane 4 RS boite mécaButée Embrayage (récepteur) d'origine Megane 4 RS boite méca
                                                                                                                                                              Butée Embrayage (récepteur) d'origine Megane 4 RS boite méca
                                                                                                                                                              €300.24Price
                                                                                                                                                              Butée Embrayage (récepteur) d'origine Megane 4 RS boite mécaButée Embrayage (récepteur) d'origine Megane 4 RS boite méca
                                                                                                                                                                  Butée Embrayage (récepteur) d'origine Megane 4 RS boite méca
                                                                                                                                                                  €300.24Price