An Enduro Bearings exclusive, our XD-15 Pro BBs feature XD-15 15° Angular Contact cartridge bearings pressed into precision machined aluminum cups that simply thread directly into the BB shell. 

Utilizing the same XD-15 steel as our XD-15 Corsa bearing, Enduro XD-15 Pro bearings offer a 15º angular contact sealed bearing in a standard-sized cartridge.

XD-15 Pro bearings feature deep-groove raceways allowing for maximum sized Grade 3 Silicon Nitride ceramic balls for for increased contact area and improved performance and longevity.

Enduro XD-15 bottom brackets are manufactured to the highest standards at the Enduro Bearings production facility in California, USA.

Enduoro XD-15 bearings combine corrosion-proof, cryogenically treated nitrogen steel races with Silicon Nitride Grade 3 ceramic balls in a proprietary process that results in the ultimate high performance bearing setup.