SADEV 55-Tooth Crownwheel (17-Shaft) F9001012 - ST75 Sequential Gearbox

The SADEV 55-Tooth Crownwheel F9001012: The Impact of a Degraded Final Drive

On a competition vehicle like the Renault Clio 2 Cup, the final drive is the point of no return for power. The 55-tooth crownwheel is subject to extreme torque forces. Installing a non-genuine part, or ignoring signs of wear, means running the risk of losing the integrity of your entire SADEV ST75 sequential gearbox.

What You Risk Losing by Neglecting This SADEV Part:

Destruction of the 17/55 Final Drive Ratio and Severe Immobilization

If the 55-tooth crownwheel (reference F9001012) shows the slightest crack or irregular wear, the meshing with the 17-tooth shaft is compromised. You lose transmission precision, which generates shocks. The risk of final drive failure and an irreparable breakdown on the track is high. This means losing valuable time in competition and multiplying repair costs.

Weakening of the Differential and Adjacent Bearings

The crownwheel is directly bolted to the differential housing. If it fails, it transmits abnormal vibrations and forces to the bearings and the limited-slip differential. You lose the lifespan of critical and costly components in your SADEV ST75 gearbox, increasing the total cost of ownership of your sports vehicle.

OPTIMIZ ACCESS: SADEV Distributor with Renault Sport Expertise

Since 2010, OPTIMIZ ACCESS has been the partner of drivers and racing teams. We supply quality parts and service based on E.E.A.T. expertise for servicing sports vehicles. Our status as an official SADEV distributor for the Clio 2 Cup, Clio 2 Gr N, Clio 3 Cup, Megane N4, and Twingo R2 assures you the authenticity of reference F9001012.

Buying Advice and Customer Optimization (SEO)

« Should the 55-tooth crownwheel be replaced with the shaft? »

Absolutely. To ensure maximum reliability of the 17/55 final drive ratio in your ST75 sequential gearbox, it is imperative to always replace the 55-tooth crownwheel and the 17-tooth secondary shaft together. The corresponding shaft and SADEV screws are available at the bottom of the page.

« Is this crownwheel compatible with my Clio 2 X65 Cup? »

Yes, the reference F9001012 is specifically intended for the 17/55 final drive ratio of SADEV ST75 gearboxes. It is one of the homologated configurations for the Renault Clio 2 Cup. Always verify the ratio currently fitted to your vehicle.

« Does OPTIMIZ ACCESS provide crownwheel installation and ST75 gearbox maintenance? »

Yes. Our workshops in Hauts-de-France (near Lille, Arras, Cambrai, Douai, Saint Quentin) specialize in the dismantling, assembly, and adjustment of SADEV sequential gearboxes. Contact us for a complete customization and servicing solution.

Real Stock and Fast International Shipping

Performance cannot wait. This quality SADEV crownwheel is in stock. We guarantee fast and secure shipping for France and export across the globe.