XRAY RX8 19T Hardened Pinion Upgrade by Arrowmax AM-RX8-348519  [AM-RX8-348519]

Performance Pinion for XRAY RX8

The Arrowmax AM-RX8-348519 pinion is a purpose-built replacement for the XRAY RX8, designed to fit directly as the motor pinion in the clutch and gearbox assembly of that model.

Forged from 7075-T6 aluminium and given a hard coating, the tooth form is cut to align with XRAY spur gears for dependable mesh. Arrowmax lists this part across 16T, 17T, 18T, 19T, 20T and 21T choices so you can change the drive ratio by swapping pinions without touching the spur.

Fitment tips: set mesh and axial alignment correctly before running, fit any required shims or a pinion spacer to suit the RX8 motor mount, and secure the pinion with the correct set screw torque. Minor mesh or backlash changes will influence wear and drivetrain noise, so recheck after a brief track session.

Setup advice: a lower tooth count favours quicker acceleration while higher counts favour top speed. Adjust in small increments and monitor both motor load and tooth wear to maintain smooth operation.