Shimano Bottom Bracket BB-UN54. 107 BC137 73 Width 107 mm (MM107). BC 1.37 x 24 Axle length/shell width (mm)|LL107|73 (BC1.37). Brand:Shimano A good quality bottom bracket for traditional chainsets. Key Features: Super-accurate bearings for smooth operation and improved durability Durable, hard-wearing sealed cartridge bottom bracket with square tapered spindle fitting Lightweight hollow spindle Maintenance-free sealed cartridge bearing assembly keeps out dirt, mud, and water for long bearing life Fast and easy installation without adjustment Narrow body allows clearance for cable routing under the bottom bracket
