Shimano's BB-UN55 Square Spindle Bottom Brackets are the unofficial standard for English-threaded cartridge bottom brackets. Quality, value, and durability come together to keep you cranking for many, many miles. - Fits JIS Square-Taper Cranksets - Hollow spindle - Crankarm fixing bolts not included

Shimano's Ultegra bottom bracket uses Pro Tour-proven technology for lighter weight and super smooth spinning, while still maintaining the same level of durability and stiffness. It's available in English, Italian, or Press Fit models.

SRAM saw the opportunity to make a better press fit system where all the best from BB30 and PressFit bottom brackets would be combined into one captivating package. Pressfit 30 will feature an integrated seal, pre-assembled into the cups, to further prolong bearing life. The key difference with Pressfit 30 is how the bearings are fitted into the frame. Bearings are housed in nylon cups which will be pressed into the frames bottom bracket shell. This bottom bracket is designed for 30mm spindle cranksets. - Easy installation - PressFit cups for lighter weight - Narrow Q-factor and more ankle clearance - Integrated gutter seal to prolong life - Integrated adjuster - 30mm spindle diameter For installing any crankset with a BB30 spindle into any BB30 frame or frame with 46mm I.D. press fit diameter bottom bracket shell - BB Shell Width (mm): 68 mm, 73 mm, 79 mm, 86 mm, 92 mm - BB/Frame Interface: 386 EVO, BBright Press Fit, PF30, 392 EVO - Bottom Bracket Shell I.D.: 46 - Spindle Interface Type: e*Thirteen P3 Connect, 392 EVO, 386 EVO, Campagnolo Over-Torque, Hope BSA30, RaceFace/Easton CINCH, Rotor 3D+

Dimension American bottom bracket for one-piece cranks. - Include cups, bearings and cones - 24 tpi