Shimano Un55 Bottom Bracket BS 73 113mm BBUN55C13

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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 fittingLightweight hollow spindleMaintenance-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