The Shimano BB-UN300 Bottom Bracket is ideal for when you need to replace your worn square tapered bottom bracket.

Features:

• A good quality bottom bracket for traditional chainsets
• Super-accurate bearings for smooth operation and improved durability
• Durable, hard-wearing sealed cartridge bottom bracket with square tapered spindle fitting
• Maintenance-free sealed cartridge bearing assembly keeps out dirt, mud, and water for long bearing life
• Fast and easy installation without adjustment
• Narrow body allows clearance for cable routing under the bottom bracket
• Available for 68mm & 73mm BB shell and in various lengths to suit your setup