Shimano BB-UN300
The Shimano BB-UN300 is a simple, reliable square taper bottom bracket with sealed cartridge bearings and a Cr-Mo axle. It replaces both the BB-UN26 and BB-UN55, and is available in British threading with 68mm and 73mm shell widths across a range of axle lengths.
- Sealed cartridge bearings and a Cr-Mo axle
- Direct replacement for BB-UN26 and BB-UN55
- British thread, 68mm and 73mm shell widths, axle lengths from 107mm to 127.5mm
- For bikes with a chain case, choose BB-UN300-K; for E-type front derailleur compatibility, choose BB-UN300-E
- Fixing bolts not included — Shimano FC-E6000 bolts suggested
Pairs well with
Shimano BB-UN300
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