This Shimano square taper bottom bracket uses super-accurate bearings for smooth operation and improved durability
113mm for 68mm bottom bracket shell, 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
Shimano code: BB-UN300 previous code was UN-55
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