Tripeak Grade 5, Si3N4 Hybrid Ceramic Bearings w/ black oxide，#6902 (15 x 28 x 7 mm)

The Tripeak Grade 5 Si3N4 ceramic hybrid bearing (6902, 15x28x7mm) is a precision replacement bearing for cycling applications—bottom brackets, hub bearings, and pulley wheels that use the 6902 standard.

Grade 5 silicon nitride ceramic balls paired with hardened steel races deliver measurably lower friction than all-steel alternatives. The 15x28x7mm dimensions (6902 standard) are commonly used in road bike hubs and some bottom bracket applications.

Sealed construction protects against water and debris intrusion. These bearings suit riders upgrading stock steel bearings to ceramic for efficiency gains.

Reduced rolling resistance for faster speeds
3-5× longer lifespan than standard steel bearings
Enhanced thermal stability—maintains performance under sustained load
Corrosion-resistant design for all-weather reliability
Professional quality without premium markup

Size: 15mm ID × 26mm OD × 7mm Width | Material: Si3N4 ceramic + CrSteel | Double sealed