Bottom Bracket Shimano BB-UN300 Square Taper 68mm BSA
Shimano BB-UN300 Square Taper bottom bracket for 68 mm BSA frames. Durable cartridge bearing design with improved chain line stability for smooth everyday riding.
Overview
Bottom Bracket Shimano BB-UN300 Square Taper 68mm BSA
The Shimano BB-UN300 is a high-quality and reliable JIS Square Taper bottom bracket designed for widely used square taper cranksets. It is a classic solution suitable for MTB, city and hybrid bikes.
Designed for frames with BSA threading and a 68 mm bottom bracket shell width, the cartridge bearing construction ensures smooth rotation, stable power transfer and long service life.
An integrated chain line stabilizer improves chain alignment, supporting better shifting performance and reduced drivetrain wear. The BB-UN300 supports standard, E-type and chain case configurations, offering excellent versatility.
- Model: BB-UN300
- Type: Square Taper (JIS)
- Thread: BSA
- BB shell width: 68 mm
- Adapter material: Aluminum
