Bottom Bracket BB-UN300 73x123mm for English Shell, JIS Square-Taper

Fits JIS square-taper cranksets Features a hollow spindle for strength and reduced weight Spindle length measures 122.5mm for compatibility with specific frames Fits English (BSA) bottom bracket shells with a 73mm shell width Crankarm fixing bolts are sold separately, allowing customization and replacement options BB-UN300 Square Spindle Bottom BracketsFits JIS square-taper cranksetsCrankarm fixing bolts sold separatelyHollow spindleItem SpecificationsBottom Bracket Shell I.D.1.37BB/Frame InterfaceEnglishBB Shell Width (mm)73Spindle Interface TypeSquare Taper JISSpindle Length123Defined ColorBlack