Tamiya F103RM Rear Axle Offset Spacer Upgrade F103RM-03 by 3Racing  [F103RM-03]

Rear axle spacer brief

The F103RM-03 offset spacer is a compact tuning part for the Tamiya F103RM chassis that lets you shift the rear axle mount plane up or down. It targets subtle changes to rear track and toe rather than wholesale suspension redesign.

Application: use the spacer to fine tune rotation and rear traction, or to rectify balance issues introduced by other setup changes such as roll centre or anti-squat adjustments.

Fitment advice: install the spacer in place of, or stacked with, the OEM spacer pieces on the rear axle. Standard touring car hand tools are adequate; after installation, inspect axle preload and wheel alignment and confirm no interference with bodywork or suspension travel.

Use incremental changes and on-track testing to validate the spacer setting that gives the best balance between bite and rotation.