Bottom Brackets

BB-UN26 cartridge bottom bracket. - Smooth rotation - Square taper spindle - Sealed cartridge bearing assembly

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

Origin-8's ISIS Bottom Bracket is everything you need to get your wheels rolling. It features a steel body and hollow-chromoly spindle that adds stiffness and cuts down on weight. The sealed bearings are super smooth and durable, and this fine BB is available in 3 sizes with a 68mm shell.