Shimano un55 model has super-accurate bearings for smooth operation and improved durability.
Features:
- A good quality bottom bracket for traditional chainsetsDurable, hard-wearing sealed cartridge bottom bracket with square tapered spindle fittingMaintenance-free sealed cartridge bearing assemblyKeeps out dirt, mud and water for long bearing lifeSuper-accurate bearings for smooth operation and improved durabilityFast and easy installation without adjustmentLightweight hollow spindleNarrow body allows clearance for cable routing under the bottom bracket