Kyosho Optima Service Ball Bearing Set 20pcs - JR-CBR-KS-007 by Jazrider  [JR-CBR-KS-007]

20 bearings arranged for routine RC maintenance

This 20pcs bearing kit is an aftermarket replacement pack from Jazrider for Kyosho Optima applications, designed to support drivetrain and steering component servicing on small touring and light off-road models. The assortment collects the typical sizes needed to refresh hubs, shafts and pivots in one purchase.

The bearings are sorted by size and use metal shields for straightforward fitting and moderate protection against debris. Quantities correspond to usual wear locations so you can tackle common maintenance without buying individual parts separately.

• 3 x 6 x 2.5 mm — 2 pcs
• 4 x 8 x 3 mm — 2 pcs
• 5 x 10 x 4 mm — 10 pcs
• 10 x 15 x 4 mm — 4 pcs

Installation pointers: replace bearings that show play or rough operation, ensure bores are clean before pressing, and apply force to the outer race to prevent bearing damage. After motor or pinion bearing changes, confirm shaft alignment and gear mesh. Metal shields ease maintenance but are not a substitute for sealed bearings in harsh wet or muddy conditions.

On-track benefit: renewing worn bearings reduces drivetrain drag and can improve throttle smoothness and steering feedback, most apparent with higher-revving motors and tight gear ratios. Use this as a maintenance kit; choose competition-grade sealed or low-friction bearings when maximum performance is required.