When chasing consistent lap times, the ability to tweak roller angles matters. The Tamiya 94729 JR Roller Angle Adjuster Plate is built with carbon reinforcement and enables 1-degree changes over a -3 degree to +3 degree range to help fine tune cornering and stability.
The set comes with three plates so you can compare different angles without fabricating parts. It will fit most Mini 4WD models that have roller mounts but do check for any bodywork that might need minor modification to clear the assembly.
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