Included here are Jr 13mm ball-race rollers in a ringless format, presented in a gold finish. These rollers are intended as spare parts for Mini 4WD vehicles, featuring ball-race internals and a nominal 13mm rolling diameter as indicated in the product label. The ringless layout removes the outer retaining ring seen on some rollers, changing the visible profile and influencing the bearing outer contact.
Enthusiast builders often choose these rollers for setups where compact 13mm roller geometry is required. They are compatible with many standard roller mounts on performance-oriented chassis and can be used as direct replacements or for visual upgrades. The gold coating is largely aesthetic and useful for matching colour schemes or identifying parts.
Service advice: clean bearings using an appropriate solvent and apply a light bearing oil if necessary. Inspect for play prior to refitting. For mounting specifics and fit checks consult documentation for Super-II, MA, MS, AR and related chassis types; do not assume compatibility with non-standard or heavily modified mounts without trial fitting.
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