FWD Ratio Tuning Pulley 21T - Arrowmax AM-920041  [AM-920041]

21T Medius pulley for FWD tuning

The Arrowmax AM-920041 AM Medius FWD Pully 21T Aium 7075 is an RC drive pulley made for front-wheel drive (FWD) configurations. This listing describes a 21-tooth pulley manufactured in Aium 7075, intended for use as a replacement or as an upgrade where a 21T FWD pulley is appropriate.

Installation on compatible FWD pulley assemblies is simple: remove the current pulley following your chassis maintenance steps, check shaft straightness and bearing integrity, slide the AM Medius pulley onto the shaft, and fasten with the existing fixing hardware. Ensure proper alignment and bearing seating to minimise wear.

When tuning, a 21T pulley modifies the rotational ratio and can be used for small incremental adjustments to acceleration and drivetrain behaviour on FWD RC cars. Pair this change with measured tuning elsewhere in the transmission to evaluate handling and motor load outcomes.

Use AM-920041 when you need a 21T FWD pulley for tuning or replacement, and inspect shaft and bearing condition during installation to keep the drivetrain reliable.