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

Service pack for drivetrain and steering bearings

This 20pcs bearing kit is an aftermarket replacement pack from Jazrider for Kyosho Optima applications, supplying the typical bearing sizes used in small touring and light off-road Kyosho models. It is intended to let you renew wheel hubs, motor shafts, idlers and suspension pivots with one kit.

The bearings are arranged by size and come metal shielded for easy installation and basic resistance to contamination. The quantities reflect common service points so routine maintenance often requires fewer separate purchases.

• 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 guidance: replace units that show play or roughness, clean housings before pressing new bearings in, and use a driver sized to the outer race to avoid inner race damage. After fitting motor or pinion bearings, check clearances and gear mesh to preserve smooth operation. Metal shields aid upkeep but are not a replacement for sealed bearings in wet or muddy use.

Effect on handling: fresh bearings lower drivetrain drag and can deliver more consistent throttle reaction and steering feedback, particularly with high-rev motors and tight gear ratios. Treat this set as a maintenance-oriented supply; select precision or sealed-bearing options for low-drag competition requirements.