This is a Delrin 42‑pitch 61‑tooth spur gear produced by GPM as an aftermarket replacement for TAMIYA TT01 scale RC cars. It is intended as a direct spare for the large spur gear in the TT01 gearbox, serving routine replacement, maintenance, or setup changes when adjusting gear ratios and drivetrain behaviour.
The part is described as an RC‑scale spur gear only, and is intended to interface with standard 42‑pitch pinion gears used on TT01 builds. When swapping the spur gear, check mesh with the motor pinion and confirm proper clearance to avoid premature wear. Use correct shimming practices and inspect the companion bearings and spur hub during service intervals.
Practical tuning role: changing spur tooth count affects the final drive ratio and throttle response, so a 61T spur can be chosen to balance acceleration and top speed depending on track layout and motor/ESC setup. This Delrin component offers a low‑friction material option commonly selected to reduce gear noise and smooth engagement relative to some plastics.
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