Mugen MRX-5 16T First Pinion Hard-Coated 7075-T6 - Arrowmax AM-MRX5-H0757  [AM-MRX5-H0757]

Replacement first pinion for MRX-5

This 16T first pinion is an aftermarket replacement built for the Mugen MRX-5 series. Crafted from 7075-T6 aluminium with a hard-coated surface finish, it offers improved wear resistance while keeping rotating weight low for clutch stage applications in 1/8 scale models.

Fitting guidance: locate the pinion on the clutch pinion shaft and follow your usual service routine, set the gear mesh to the supplier's clearance recommendation and verify free rotation of the motor and spur before operating. Adjust clutch preload carefully and re-check engagement after any pinion change to prevent unnecessary wear to the spur or clutch components.

Performance effect: selecting different pinion tooth counts changes the final drive and modifies throttle and engine braking response on clutch-driven setups; the 16T provides a defined gearing step helpful when dialling in acceleration versus top speed on MRX-5 cars.