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BKC0751 | Ceramic XD-15 Angular Contact Bearing
An Enduro Bearings exclusive, our XD15 Pro BBs feature XD15 15 degree Angular Contact cartridge bearings pressed into precision machined aluminum T47 cups that simply thread directly into the BB shell. Utilizing the same XD15 steel as our XD15 Corsa bearing, Enduro XD15 Pro bearings offer a 15 degree angular contact sealed bearing in a standard-sized cartridge. XD15 Pro bearings feature deep-groove raceways allowing for maximum sized grade 5 Silicon Nitride ceramic balls for for increased contact area and improved performance and longevity. Enduro XD15 bottom brackets are manufactured to the highest standards at the Enduro Bearings production facility in California, USA. Enduro XD15 bearings combine corrosion-proof, cryogenically treated nitrogen steel races with Silicon Nitride grade 5 ceramic balls in a proprietary process that results in the ultimate high performance bearing setup.

The T47A (Asymmetrical) specification is a new thread-in standard that has is similar in concept to BBRight (but with threads) that been used by a couple brands, including Cervelo and Factor.