XRAY RX8 21T Replacement Pinion Gear - Arrowmax AM-RX8-348521  [AM-RX8-348521]

21T replacement pinion made for XRAY RX8

The Arrowmax AM-RX8-348521 is a 21-tooth pinion produced for the XRAY RX8 platform, constructed from 7075-T6 aluminium and treated with a hard-coated finish. It is supplied as a direct 2nd-stage replacement for RX8 vehicles where altering tooth count is used to adjust the final drive ratio and motor load.

Key points hobbyists should note:

• Material and finish: manufactured from 7075-T6 aluminium and hard-coated to resist wear during spur engagement.
• Role in drivetrain: fitted as the 2nd-stage pinion to change final drive ratio and influence acceleration versus top speed characteristics.
• Compatibility: intended for XRAY RX8 series applications; confirm RX8 pinion geometry and shaft compatibility prior to fitting.

Practical installation and setup notes

When replacing pinions check spur mesh and torque the set screw to the RX8 motor mount recommended value. Remove any machining burrs before mounting and re-check mesh after a short run-in period. Adjusting between 16T-21T will affect RPM and drivetrain loading in a predictable way, so tweak ESC settings and gearing to match your preferences.