Mugen MRX5 First Gear 15T Hardened 7075 Aluminium - Arrowmax AM-MRX5-A0001  [AM-MRX5-A0001]

Arrowmax hardened 7075 1st gear for MRX5

This 1st gear is supplied for Mugen MRX5 models and is listed as Arrowmax part AM-MRX5-A0001. It is manufactured from 7075 aluminium with a hard finish and intended to replace the first-stage gear in the transmission when wear or damage is found.

Fit a new 1st gear if you notice backlash, tooth fatigue, or uneven engagement; replacing the worn item restores correct tooth contact and helps keep power delivery smooth through the gearbox. The gear is supplied as a single component to fit the MRX5 gearbox and standard spur and pinion pairings used on that chassis.

At installation, check mesh and backlash against the motor pinion and spur, verify bearings are correctly seated, and confirm free rotation before completing assembly. Avoid excessive clamp or screw torque to prevent seating distortion. A light application of gear lubricant on the face will reduce initial wear during break-in.