The Shimano BB-UN55-E 73mm-110mm Bottom Bracket is a durable square-taper cartridge bottom bracket built around Shimano’s proven BB-UN55 design.
Key Features:
- Designed for JIS square-taper cranksets.
- 73mm shell width with a 110mm spindle length.
- Hollow spindle construction provides a durable and practical design.
- Cartridge-style bottom bracket offers a reliable, low-maintenance setup.
- Built for English-threaded bottom bracket shells.
- Shimano BB-UN55 design combines durability, value, and long-term reliability.
- Provides a secure square-taper interface for compatible cranksets.
Who is it for?
Riders and mechanics looking for a durable replacement bottom bracket for a compatible English-threaded frame and JIS square-taper crankset.
Specifications may differ from the photo and are subject to change without prior notice.
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