Shimano BB-UN300 BSA Bottom Bracket 123/73mm

Maximize the efficiency and durability of your bike with the Shimano BB-UN300 BSA bottom bracket, an essential component for any serious cyclist looking for performance and reliability.

• Shaft type: Square.
• Shaft length: 123mm.
• Case width: 73mm (BSA).
• Adapter material: Aluminum.
• No fixing screw included.
• Chain box variant and chain line stabilizer for better stability.

Excellence and Precision in Every Pedal Stroke

Discover the quality and performance that only Shimano can offer with the BB-UN300 BSA 123/73mm bottom bracket, designed for cyclists who demand the best in every component of their bicycle.

Technical specifications

This bottom bracket features a 123mm square axle and 73mm BSA case width, ideal for a wide range of bikes. Manufactured from high quality materials, including an aluminum adapter that ensures a firm and durable mount.

Innovative Design

It integrates a chain line stabilizer that significantly improves stability during pedaling, increasing efficiency and comfort in each ride.

Assembly and Maintenance

Easy to install and maintain, this bottom bracket comes without a fixing screw, allowing customization according to the specific needs of each cyclist and their bike.