MUGEN MRX-5 21T Second Gear Upgrade by Arrowmax AM-MRX5-H0762  [AM-MRX5-H0762]

Arrowmax AM-MRX5-H0762 2nd. Gear 21T (7075 HARD)
Price:
NZD$10.20
Brand:
Arrowmax
Model:
AM-MRX5-H0762
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MRX-5 21T Aluminium Second Gear

The Arrowmax AM-MRX5-H0762 2nd. Gear 21T is intended for use with the MUGEN MRX-5 and is manufactured from 7075-T6 aluminium with a protective hard coat to reduce wear while handling typical RC drivetrain stresses.

As part of a series of tooth-count options, the 21T pinion allows easy ratio changes to tune acceleration versus top speed for track conditions or practice laps. It is designed to mesh with the MRX-5 spur gear and fits when the shaft size and gear profile match the original MRX-5 layout.

Fitting advice: this is a gearbox replacement part so standard disassembly is required. Reassemble the gearbox following normal service steps, confirm correct mesh and endplay, and check bearings and spur gear for wear when swapping gears.

Compatible Models

  • MUGEN MRX-5

Can this 21T replace the stock MRX-5 second gear directly?

If your MRX-5 gearbox uses the standard second gear dimensions, the Arrowmax AM-MRX5-H0762 is a drop-in replacement, otherwise check shaft and keyway dimensions before fitting.

Is the hard coat suitable for high power setups?

The hard coating increases surface durability, but for very high torque or brushless setups inspect gear wear regularly and monitor bearings under load.

Should I lubricate this gear?

Use a light gear-safe grease on bearings and mating surfaces; avoid heavy glues or compounds on the gear teeth which can attract debris.

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