XRAY NT1 2nd Gear 21T (7075 HARD) Upgrade by Arrowmax AM-NT1-338521  [AM-NT1-338521]

Second gear upgrade for the NT1 chassis

The Arrowmax AM-NT1-338521 2nd gear is manufactured as a drop-in pinion in 7075-T6 aluminium with a durable hard coat to extend service life in race use. It is sized to match XRAY NT1 spur profiles and suits RC competition drive trains.

Use this part when adjusting the final drive or replacing a worn second gear; varying the tooth count shifts acceleration versus top speed so record both stock and replacement tooth counts while testing. The same gear range includes 16T up to 23T for fine-grain ratio steps without changing other drivetrain parts.

Installation tips: mount the gear on the NT1 second shaft, confirm it sits concentric and at the correct axial position, then set a minimal, even pinion-to-spur mesh to avoid premature wear. Perform a short moderate-load break-in run after fitting and re-check mesh and fastener torque before pushing hard.