Mugen MRX5 Belt Pulley 20T 7075 Hard Coated - Arrowmax AM-MRX5-H0251B  [AM-MRX5-H0251B]

MRX5 lightweight belt pulley

This Arrowmax AM-MRX5-H0251B pulley is an RC-scale replacement made specifically for the Mugen MRX5 belt-drive layout. It is CNC machined from 7075 T6 aluminium and given a hard-coated finish to provide a durable, low-mass rotating part without altering existing shaft arrangements.

Design notes: the side vent holes help eject grit from the contact area, reducing trapped debris on the belt face. The hard coat increases wear life while the 7075 alloy keeps mass low to aid faster spool-up in belt-driven tuning setups. Installation uses the MRX5 chassis retention method so no extra adapter is needed when swapping the stock pulley.

Tuning role: fit this pulley to cut rotating inertia compared with heavier options, keep belt engagement consistent in typical track conditions, and make routine cleaning easier thanks to the drainage holes.