MUGEN MRX5 Pulley 20T 7075 Hard by Arrowmax AM-MRX5-H0251B  [AM-MRX5-H0251B]

MRX5 belt pulley for tuning

This Arrowmax AM-MRX5-H0251B pulley is an RC-scale replacement part made for the Mugen MRX5 belt-drive layout. CNC machined from 7075 T6 aluminum and hard coated, the pulley is intended as a direct option for MRX5 belt systems where users need a durable, low-mass rotating component without changing shaft arrangements.

Design notes: the side holes allow debris to exit from the contact area, reducing trapped dirt at the friction surface. The hard coating improves wear resistance while the 7075 alloy keeps mass down to support quicker spool-up in belt-driven tuning setups. Installation uses the MRX5 chassis’ existing pulley retention method so no additional adapter is required when replacing the stock pulley.

Practical tuning role: fit this pulley to reduce rotating inertia compared with heavier materials, maintain consistent belt engagement under moderate track conditions, and simplify maintenance thanks to the drainage holes.