The Shimano BB-UN55 is a high-quality sealed cartridge bottom bracket designed for smooth, reliable performance and long-lasting durability. Featuring precision bearings and a robust steel spindle, it delivers efficient power transfer while protecting against dirt, water, and everyday wear.

Compatible with bicycles using a 68 mm BSA (English) threaded bottom bracket shell and JIS square taper cranksets.

Features

• Genuine Shimano quality
• Sealed cartridge bearing design
• Smooth and low-maintenance operation
• Durable steel spindle
• Excellent protection against dirt and moisture
• Easy installation and long service life