This kit includes Jr 13mm ball-race rollers finished in gold and built in a ringless style. These components are intended as replacement rollers for Mini 4WD cars, using a ball-race arrangement and a 13mm rolling diameter as indicated by the product designation. The ringless construction removes the visible outer retaining ring, changing the external profile and the bearing contact compared with ringed types.
Seasoned builders will recognise these rollers as suited to Mini 4WD setups where compact 13mm roller geometry is required. They fit many standard roller mounts on performance-oriented chassis and function as direct replacement parts or as a cosmetic swap. The gold finish is mainly decorative and helps match colour schemes or to distinguish parts for display.
Maintenance guidance: clean bearings with an appropriate solvent and relubricate with light bearing oil when needed. Check for excessive play before reinstalling. For exact chassis fitment and mounting instructions consult Super-II, MA, MS, AR and related chassis manuals; do not assume compatibility with modified or non-standard mounts without test assembly.
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