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Shimano BB-UN300 bottom bracket British thread 68 - 118 mm

BBUN300B18

Shimano

Shimano BB-UN300 bottom bracket British thread, 68 - 118 mm

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£23.99

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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

Reviews

Grade 
11/04/2025

Beautiful bit of kit

So much nicer than the black plastic one from Brompton that lasted only 3 years.

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    Shimano BB-UN300 bottom bracket British thread 68 - 118 mm

    Shimano BB-UN300 bottom bracket British thread 68 - 118 mm

    Shimano BB-UN300 bottom bracket British thread, 68 - 118 mm

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    Data sheet

    Bottom Bracket Shell Size68mm