Kyosho Motorcycle Steel Main Gear by GPM SKM155  [SKM155]

Main application and role

This steel main gear is an RC-scale replacement part produced by GPM for Kyosho motorcycle platforms, intended to serve as a durable spur in the drivetrain of Kyosho motorcycle models that share the same gear form factor. The piece is a single aftermarket main gear designed to fit into the model's existing gearbox layout and work with standard RC drivetrain components.

In practical terms the part replaces worn or damaged stock gears, restores original gear engagement, and plays a role in tuning by preserving gear mesh consistency. Because it is steel, the gear focuses on wear resistance compared with typical plastic alternatives, and it is suitable where riders prefer longer-term durability at the gearbox level on scale motorcycle models.

Installation is straightforward on compatible Kyosho motorcycle gearboxes: remove the gearbox cover, compare tooth count and bore fit with the original gear, seat the gear on the shaft ensuring correct axial location, check mesh with the pinion, and reassemble while confirming smooth rotation without binding. As with all drivetrain work on RC models, inspect mating parts and bearings for wear before final assembly.