Tripeak Grade 5，Si3N4 Hybrid Ceramic Bearings w/ black oxide，#6903 (17 x 30 x 7 mm)

Featuring Grade 5 Silicon Nitride (Si₃N₄) ceramic balls, precision-machined steel races with a black oxide coating, and low-friction seals, this bearing delivers exceptionally smooth rotation, reduced rolling resistance, and excellent protection against corrosion.

Designed for high-performance road, gravel, MTB, and racing applications, the #6903 bearing minimizes friction while maintaining excellent durability under demanding riding conditions. Whether you're replacing worn bearings or upgrading your wheel hubs or other compatible components, Tripeak hybrid ceramic bearings provide reliable, race-proven performance.

Grade 5 Si₃N₄ Hybrid Ceramic Balls
Premium Silicon Nitride ceramic balls provide lower rolling resistance, improved efficiency, and longer service life compared to standard steel bearings.

Black Oxide Steel Races
Precision steel races with a black oxide finish enhance corrosion resistance and improve durability in wet and harsh riding conditions.

Smooth & Efficient Performance
Engineered to reduce friction for faster acceleration, improved power transfer, and smoother wheel rotation.

Low-Resistance Sealing
High-quality seals help keep out dirt, dust, and moisture while maintaining low rotational drag for consistent performance.

High-Speed Stability
Designed for reliable operation under high-speed and high-load riding conditions with reduced vibration and noise.

Race-Proven Reliability
Ideal for road bikes, mountain bikes, gravel bikes, and performance wheelsets requiring #6903 bearings.