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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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Genuine Renault Gearbox/Engine Fixing Stud (78mm) - Clio 2 RS, Clio 2 Gr N, Clio 3 RS
Authentic Renault fixing stud, 78mm length.
Ensures a solid and precise connection between the gearbox and the engine.
Specifically designed for Renault Clio 2 RS, Clio 2 Gr N, and Clio 3 RS models.
You can also find the...
€4.91Price
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
Gearbox Reverse Gear Unlock Cable Renault Sport Clio 3 X85 Cup SADEV ST75 (Ref: 7711160360)
Ensure the reliable operation of the reverse gear mechanism of your Renault Clio 3 X85 Cup equipped with the SADEV ST75 sequential gearbox with this genuine Renault Sport reverse gear unlock cable (Ref: 7711160360 ). A...
€195.66Price
Do not let an approximate transmission compromise your stage times. This 56-tooth crown wheel for 11-tooth shafts is an official Renault Sport component, engineered by SADEV specifically for the Renault Clio 2 Group N equipped with the ST66 gearbox . As the exclusive distributor of SADEV parts for the Renault...
€820.75Price
Do not risk a catastrophic mechanical failure of your gearbox, severe whining noises during gear changes, or an input shaft misalignment that will prematurely destroy your brand-new clutch kit. The premium Roulement de guidage d'arbre primaire pour Renault Sport (Clio 2 RS, Clio 3...
€12.84Price
Arbre Secondaire 11 dents (pour couronne 56 dents) Clio Gr N Référence: 7711129543
€1,004.35Price
Ensure your transmission reliability with this genuine Renault Sport NTN cup . A key component of your drive shaft assembly, it is specifically designed for the Renault Clio 2 Cup (X65) , Clio 2 Group N , Clio 3 Cup (X85) , and Clio R3 . This official component guarantees perfect...
€7.32Price
Couple 12X53 - petites canelures Twingo R2
Référence: 7711162863
€1,767.94Price
Tuyau entrée butée (nouveau diamètre)
€45.26Price
Couronne 63 dents ( 12 / 63 ) équipée Clio Gr N Référence: F19030231
€898.58Price
Don't let poor gear ratios ruin your stage times. This official 52-tooth crown wheel , manufactured by SADEV for Renault Sport , is the key component for your 11/52 final drive . Specifically designed for the Renault Clio 2 Gr.N equipped with the ST66 gearbox , it...
€565.21Price
Do not let a fragile transmission compromise your rally performance. This 11-tooth secondary shaft , specifically designed to mate with a 52-tooth crown wheel , is an official Renault Sport competition part manufactured by SADEV . Destined for the ST66 gearbox of the Renault Clio 2 Group N ,...
€1,075.99Price
En Stock
€988.36
Price
En Stock
€988.36
Price
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
Couple 12X57 court - grosses cannelures Twingo R2 Référence: 7711167609
€1,746.37Price
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
Arbre secondaire 12 dents (pour couronne 63 dts) Clio Gr N 7711129473
€1,017.37Price
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
Optimize your transmission's top speed with the 12X53 Long Final Drive (large splines) specifically developed for the Twingo R2 . This crown wheel and pinion set, available under reference 7711167608 , is the ideal solution to adapt your final...
€1,810.32Price
Protect your competition transmission with this left-hand gearbox side CV boot for the Clio R3 (reference 7711160753 ). This specific Renault Sport component is essential for maintaining the seal of your gearbox and ensuring optimal...
€25.91Price
Avoid transmission issues caused by a worn or deformed retaining ring during maintenance of your competition vehicle. The Ø40 external circlip for Clio Group N , sold under reference 0601010 , is intended for Renault Clio 2 Group N ...
€2.26Price
ELF Tranself NFX SAE 75W Gearbox Oil – 1 Litre
The ELF Tranself NFX SAE 75W gearbox oil is a synthetic transmission lubricant designed for manual gearboxes requiring...
€18.79Price
The Sadev F1903052 protection guard is an essential safety component for the reliability of the ST66 dog-ring gearbox in your Renault Clio 2 Gr N . It protects vital differential components against debris and external shocks, thus avoiding costly damage to the transmission . ...
€58.50Price
Don't let a simple failure compromise the driving precision of your Clio 2 RS . This right-hand driveshaft oil seal (joint spi) is a genuine RENAULT original part , guaranteeing renewed **reliability and performance**. Essential for the sealing of your gearbox, it maintains the oil level and protects your...
€26.29Price
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
Pivot surmoulé Clio 2 RS et Gr N
Point d'appui pour le mouvement de la fourchette de boite
€4.18Price
Rondelle mince de calage ép. 0,50 - pour rlt 6205 - 6304
€21.80Price
Durably protect your gearshift mechanism with this genuine Renault gearbox linkage boot . Designed to seal the junction between the gear selector rod and the connection link (or quickshift ), it prevents dust and moisture from entering. This OEM component is essential for owners of the Clio 2...
€15.30Price
Do not risk a loose clutch pedal sticking to the floorboard during quick shifts, a total locking out of gear changes at high RPM, or an asymmetrical clamping pressure that will destroy your manual JC5 gearbox. The premium heavy-duty Fourchette d'embrayage et butée d'embrayage Clio 2...
€94.62Price
En Stock
€3.36
Price
En Stock
€3.36
Price
Secure essential components of your Twingo R2 or Clio 3 X85 Cup with the original Renault CHC M10-55 screw. Don't risk incorrect installation or dangerous loosening. Discover other necessary fasteners for perfect assembly.
€3.36Price
Entretoise plastique pour selecteur Megane 3 RS
€0.46Price
Never underestimate the importance of small parts! This SADEV reverse gear shift fork circlip (P/N: 0601002 ) is an essential safety component for your ST66 dog-ring gearbox in the Renault Clio 2 Gr N . It ensures the precise retention of the reverse gear shift fork , preventing any misalignment or jamming....
€1.44Price
Cale de butée embrayage série Twingo R2
Référence: 7711162840
€55.32Price
Maximize your braking system's reliability with this brake fluid separation kit for hydraulic release bearings . Designed to isolate the clutch circuit from the main braking circuit, this upgrade is essential for sports vehicles pushed to the limit on the...
€46.67Price