The SKM155 is a steel aftermarket main gear intended for Kyosho motorcycle platforms that use the same gear profile. It is supplied as a single replacement spur to integrate with the model's standard gearbox arrangement and drivetrain parts.
Designed for long service intervals, the steel construction prioritises wear resistance and repeatable engagement compared with conventional plastic spurs. The part supports stable mesh under normal hobbyist loading conditions without altering the gearbox architecture.
Installation follows standard gearbox procedures: open the case, compare tooth count and bore against the original unit, position the gear accurately on the shaft, verify pinion mesh and axial alignment, then reassemble after confirming smooth rotation. Check adjacent gears and bearings for wear during the process to ensure reliable operation.