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

Precision Medius 21T FWD pulley

The Arrowmax AM-920041 AM Medius FWD Pully 21T Aium 7075 is an RC-scale drive pulley built for front-wheel drive (FWD) drivetrain layouts. The item denotes a 21-tooth pulley made from Aium 7075, intended to function as a direct replacement or as an aftermarket upgrade when a 21T FWD pulley is needed.

Fitting is straightforward on compatible FWD pulley assemblies: remove the old pulley following your chassis maintenance routine, inspect shaft and bearing condition, slide the AM Medius pulley onto the shaft, and secure it with the original fasteners. Confirm alignment and correct bearing seating to prevent uneven wear.

For tuning purposes, a 21T pulley alters the drive ratio and is useful for small incremental tweaks to low-end acceleration and drivetrain response on FWD RC vehicles. Combine this change with measured adjustments elsewhere in the transmission to assess effects on handling and motor load.

Choose the AM-920041 when a 21T FWD pulley is required for ratio tuning or replacement, and always verify shaft and bearing condition during installation to preserve drivetrain reliability.