MUGEN MRX-5 2nd. Gear 21T by Arrowmax AM-MRX5-H0762  [AM-MRX5-H0762]

2nd. Gear 21T for MRX-5

This Arrowmax AM-MRX5-H0762 2nd. Gear 21T is a replacement second gear intended for the MUGEN MRX-5 RC chassis, manufactured from 7075-T6 aluminium with a hard coating process. The material and finish are stated to improve wear resistance compared with untreated aluminium pinions while keeping the component suitable for standard RC drivetrain loads.

The part is offered as a tooth-count option in the same series, enabling straightforward gear ratio adjustments when tuning acceleration and top-speed balance on track or during setup runs. Designed to mesh with the MRX-5 spur gear, this 21-tooth second gear serves as a drop-in option where the shaft and gearform match the original MRX-5 geometry.

Installation notes: this is an RC-scale gearbox component that replaces the MRX-5 second gear; it requires normal gearbox disassembly and reassembly following the chassis service practice to ensure correct mesh and endplay. Check existing bearings and spur gear condition when changing gearing to maintain reliable operation.

Compatibility

• MUGEN MRX-5