Shimano BB-UN300 BSA

himano BB-UN300 British Thread Square Taper Bottom Bracket ina variety of sizes for traditional chainsetsFeatures:A good quality bottom bracket for traditional chainsetsSuper-accurate bearings for smooth operation and improved durabilityDurable, hard-wearing sealed cartridge bottom bracket with square tapered spindle fittingMaintenance-free sealed... morecartridge bearing assembly keeps out dirt, mud, and water for long bearing lifeFast and easy installation without adjustmentNarrow body allows clearance for cable routing under the bottom bracket