Mugen MRX5 1st Gear 15T (7075 HARD) by Arrowmax AM-MRX5-A0001  [AM-MRX5-A0001]

Arrowmax 7075 1st gear for MRX5

This is an RC-scale 1st gear intended for Mugen MRX5 models, manufactured by Arrowmax as part number AM-MRX5-A0001. The part is machined from 7075-grade aluminum with a hard finish, intended as a direct-replacement gear for the first stage of the transmission where wear or damage has occurred.

Use it when inspecting the drivetrain for play or rounded teeth; replacing a worn 1st gear helps restore correct tooth engagement and maintain smooth power transfer through the gearbox. The gear is a single piece designed to work with existing MRX5 gearbox components and standard spur/pinion arrangements used on that chassis.

During fitment, check gear mesh and backlash with the motor pinion and spur gear, ensure bearings are seated, and confirm free rotation before full reassembly. Avoid overtightening any grub screws or clamp fittings to prevent distorting the gear seat. Routine application of light gear lubricant at the gear face can reduce initial break-in wear.