XRAY RX8 21 Tooth Hard-Coated Pinion - Arrowmax AM-RX8-348521  [AM-RX8-348521]

21T pinion upgrade for XRAY RX8

The Arrowmax AM-RX8-348521 is a 21-tooth pinion designed for the XRAY RX8 chassis, crafted from 7075-T6 aluminium and protected with a hard coat. It functions as a direct 2nd-stage replacement for racers who alter tooth count to refine gear ratio and motor loading.

Key points hobbyists should note:

• Material and finish: solid 7075-T6 aluminium finished with a hard-coated surface to help limit wear against the spur gear.
• Role in drivetrain: serves as the 2nd-stage pinion to influence final drive ratio and balance between punch and top speed.
• Compatibility: intended for XRAY RX8 layouts; ensure your RX8 pinion interface matches before fitting.

Installation and tuning guidance

Fit the pinion and set mesh carefully against the spur, then secure the set screw to the RX8 motor mount torque figures. Clean any machining residue and re-check mesh after an initial running session. Adjustments across the 16T-21T range will change RPM behaviour and drivetrain loading, so modify ESC programming and gearing choices as needed.