This pack contains Jr 13mm ball-race rollers in a ringless configuration with a gold finish. Designed as replacement rollers for Mini 4WD models, the parts use ball-race bearings and a 13mm rolling diameter, as shown by the model name. The ringless style removes the outer retaining ring seen on some rollers, changing the visible profile and the bearing contact characteristics versus ringed options.
Builders experienced with Mini 4WD commonly specify these rollers where compact 13mm geometry is desired. They can be fitted into many standard roller mounts on performance chassis and serve as direct spares or decorative swaps. The gold appearance is principally cosmetic and assists with colour matching or visual differentiation.
Care instructions: clean bearings with a suitable solvent and relubricate with a light bearing oil if needed. Inspect for play before refitting. For compatibility and mounting details consult Super-II, MA, MS, AR and related chassis documentation; do not assume fit on modified or bespoke mounts without trial assembly.
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