Enduro's top-tier XD-15 ceramic-hybrid bearing in the 6801 size, for lightweight quick-release hubs and some pedals. It runs smoother the more you ride it.

Highlights

• Radial bearing, 12 x 21 x 5mm (ID x OD x width)
• XD-15 races: corrosion-proof, cryogenically treated nitrogen steel
• Grade 5 silicon nitride ceramic balls, maximum size in deep-groove raceways
• Dual-lip labyrinth (LLB) seals with a 90% fill of Kluber NBU52 grease
• Gets smoother with use as the ceramic balls polish the races
• ABEC-5, CN clearance

What makes XD-15 different

XD-15 is Enduro's own ceramic-hybrid recipe. The races are corrosion-proof, cryogenically treated nitrogen steel, paired with Grade 5 silicon nitride ceramic balls in a proprietary process. Deep-groove raceways leave room for the largest possible balls, for more contact area, performance and longevity. Unlike most bearings, XD-15 gets better with use: as it wears in, the super-hard ceramic balls make the races even smoother, so it becomes faster and smoother with time and use.

Where it is used

Enduro says this bearing is used primarily in lightweight quick-release hubs and some pedals. Check the bearing size and clearance your hub or pedal maker specifies before ordering.

Fitting and servicing

Routine servicing isn't needed to keep the XD-15 warranty, but Enduro recommends an annual service by a professional mechanic. Where possible, leave the bearing installed while servicing. If it has to come out, Enduro advises pressing it out gently with a linear press and the hub axle rather than using a blind hole puller. Our Marrickville workshop handles hub, bottom bracket and component bearing replacement; fitting is a separate workshop service and is not included in the price.

Compatibility & fit

• Size: 12 x 21 x 5mm (ID x OD x width)
• Main uses: lightweight quick-release hubs and some pedals (per Enduro)
• Match the clearance (C3 or CN) your hub or component maker specifies