BBUN54B18 Shimano Bottom Bracket British thread 68 - 118 mmA 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 cartridge 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
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