- Simple and reliable square taper bottom bracket
- Replaces both BB-UN26 and BB-UN55
- Sealed cartridge bearings
- Cr-Mo axle
- For bicycles equipped with a chain case, select BB-UN300-K
- For E-type front derailleur compatibility, choose BB-UN300-E
Power organic pads give riders both feel and bite.
Engineered for easy installation and maintenance.
Tools-free reach adjust for quick personalization.
