Tamiya F103RM Rear Axle Offset Shim F103RM-03 for Fine Tuning by 3Racing  [F103RM-03]

Overview of the offset shim

The F103RM-03 spacer is made to work with the Tamiya F103RM platform, allowing small vertical shifts to the rear axle mounting. This component is intended as a setup tool to adjust rear track and toe characteristics without replacing suspension arms.

Role and benefits: moving the axle plane up or down alters how the rear end communicates with the tyres, helping to improve rotation, exit traction or to correct handling bias after other setup changes.

Fitting notes: the part stacks with or replaces standard axle spacer pieces on the F103RM rear assembly. Basic touring car tools are all that are needed; after fitting, verify axle preload, wheel alignment and body clearance to avoid rubbing or binding.

Treat the spacer as a precision tuning option and test changes incrementally to determine the best rear-end balance for grip and turn-in.