Shimano BB-UN300 BSA 68mm Bottom BracketThe high-quality and powerful Shimano BB-UN300 bottom bracket has a JIS square mount and is suitable for frames with a BSA thread and a 68mm shell width. A stabilizer ensures a constant chain line. Shimano BB-UN300 BSA 68mm Bottom BracketMaterial

• Adapter: aluminum (left), aluminum / steel (right)
• Shaft: steel
• For square rods
• For English threaded bottom bracket shells (BSA)
• Various sizes available
• Fast and precise assembly