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

20-piece maintenance and service bearings

This 20pcs bearing kit is an aftermarket replacement pack from Jazrider for Kyosho Optima applications and is intended for drivetrain and steering repair or refresh work on RC-scale cars. The selection groups the common bearing sizes found across small touring and entry off-road Kyosho models so routine servicing is faster.

Bearings are supplied by size and are metal shielded to balance ease of service with modest contamination protection. Counts are chosen to cover usual wear locations and reduce the need for multiple single-item purchases during maintenance cycles.

• 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

Fitting advice: remove bearings showing play or rough rotation, clean housings before pressing new units in, and use a tool that contacts the outer race to avoid inner-race damage. After replacing motor or pinion bearings, recheck shaft alignment and gear mesh. Metal shields make cleaning easier but are not substitutes for sealed bearings in wet or heavily soiled conditions.

Performance impact: renewing worn bearings reduces parasitic drag and can sharpen throttle response and steering feel, which is most noticeable with high-revving motors and close gear ratios. Consider this kit a practical service bundle rather than a drop-in high-performance upgrade; choose specialised low-friction or sealed bearings for competition use.