This Delrin spur gear is an aftermarket replacement designed for scale RC use on TAMIYA TT02 and TT02B chassis. The part is identified by DTT2B069T and offers the common 42 pitch tooth profile with 69 teeth as listed in the product title, suitable when matching a 42 pitch motor pinion.
Delrin material is chosen for its low friction and dimensional stability in model applications, helping maintain reasonable mesh under normal drivetrain loads. As an RC-scale component, it is intended to work inside the gearbox or motor-mesh area and should be inspected for wear as part of routine maintenance.
Installation notes: verify gear mesh with the vehicle's existing pinion before final assembly, check for proper axial alignment, and confirm that the motor shaft and gearbox mounting allow the 69T diameter to clear surrounding chassis parts. Use correct tools to avoid deforming the Delrin during fitment.
Tuning role: replacing a spur gear is a straightforward way to change final drive ratio on the TT02 platform; swapping to a different tooth count will affect acceleration and top speed in model-scale terms, so plan gear changes according to track and battery setup.