More informationCeramicSpeed BB86 SRAM GXP Road Bottom Brackets are compatible with specific push-fit bike frames only. The shell diameter is 41mm ID, and when the bearings and cups are pressed in, they fit the SRAM and Quarq 24 / 22mm axle. There are two versions of CeramicSpeed bearings that are installed in the cups. The first is our standard long life, low resistance bearing with hardened steel races and our super round CeramicSpeed Balls. "Coated Bearing" is our second version, which uses those same balls installed in hardened steel coated races for longer life and lower resistance.