Medius 21T FWD Pulley Upgrade - Arrowmax AM-920041  [AM-920041]

Medius 21-tooth pulley for FWD

The Arrowmax AM-920041 AM Medius FWD Pully 21T Aium 7075 is an RC drive pulley tailored for front-wheel drive (FWD) drivetrain setups. The designation refers to a 21-tooth pulley made from Aium 7075, intended as a direct swap or aftermarket upgrade where a 21T FWD pulley is required.

Fitting to compatible FWD pulley assemblies is straightforward: remove the existing pulley per your chassis maintenance routine, inspect the shaft and bearings, fit the AM Medius pulley onto the shaft, and secure with the original fixing hardware. Verify that alignment and bearing seating are correct to avoid early wear.

From a tuning perspective, moving to a 21T pulley alters the drive ratio and can be used for small, controlled adjustments to acceleration and drivetrain responsiveness on FWD RC cars. Make changes one at a time and observe handling and motor load to assess results.

Select the AM-920041 for 21T FWD ratio tuning or replacement, and always check shaft and bearing condition during installation to maintain drivetrain longevity.