The innovative SRAM DUB crank standard, featuring a 28.99 spindle, enables a more resistant design against contamination for the bottom bracket. Still maintaining the unparalleled efficiency and long-lasting features CeramicSpeed Bottom Brackets are renowned for. With a built-in dust cover for all models and a secure fit, the bearings provide exceptional performance without compromise. The hand-built CeramicSpeed bearings ensure unmatched durability and efficiency as they transfer the load from the crank to the frame. Included in the package: 2 pre-installed cups with CeramicSpeed Bearings, 2 dustcovers, 4 x 1mm spacers, CeramicSpeed All Round Grease, Sticker sheet, and Spacer tube.