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

Purpose-built MRX5 pulley for belt tuning

The Arrowmax AM-MRX5-H0251B pulley is an RC-scale swap for the Mugen MRX5 belt-drive arrangement. It is CNC milled from 7075 T6 aluminium with a hard coating to give a tough, light rotating part that does not require altering shaft positions.

Design notes: the peripheral holes provide a path for grit and water to exit the contact zone, reducing debris accumulation on the belt face. The hard-coated finish improves longevity while the 7075 material reduces mass to assist quicker spool-up during tuning runs. It mounts using the MRX5 chassis' original pulley fixing, so no extra parts are necessary.

Tuning benefits: choose this pulley to lower moment of inertia relative to heavier alloys, preserve steady belt contact under typical track conditions, and speed maintenance thanks to the vent holes.