This package supplies Jr 13mm ball-race rollers in a ringless layout and finished in gold. Intended as replacement rollers for Mini 4WD cars, the parts use ball-race internals and a 13mm rolling diameter as noted in the model name. The ringless style removes the external retaining ring common on some rollers, altering the bearing outer profile and contact surface.
Builders familiar with Mini 4WD use these where compact 13mm roller geometry is required. They mount in many standard roller holders on performance-focused chassis and act as direct spares or aesthetic replacements. The gold finish is mainly for looks and to aid visual matching or part identification.
Care tips: clean the bearings with a suitable solvent and top up with light bearing oil if necessary. Check for play before reinstalling. For precise mounting instructions and compatibility consult Super-II, MA, MS, AR and similar chassis manuals; if your mounts are non-standard or modified, trial fitting is recommended.
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