Shimano BB-UN300 bottom bracket British thread, 68 - 118 mm
Super-accurate bearings for smooth operation and improved durability
118mm for 68mm bottom bracket shell, durable, hard-wearing sealed cartridge bottom bracket with square tapered spindle fitting
This is suitable for Brompton C, P and A Line bikes with a spider crankset
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
Shimano code: BB-UN300 old Madison code: BBUN300B18X
Previous barcode: 4550170619237