The Shimano BB-UN300-K is a durable square taper bottom bracket designed to deliver consistent performance. Its cartridge bearing system ensures smooth rotation and long-lasting reliability, ideal for various cycling applications.

Precise Compatibility: With a 68mm BSA threaded shell and a 122.5mm spindle length, the BB-UN300-K is compatible with a wide range of square taper cranksets. This bottom bracket also includes a 0.7mm spacer for precise fitment, ensuring optimal alignment and functionality.

Enhanced Durability: Built to withstand rigorous use, the BB-UN300-K features Shimano’s renowned quality and performance. The sealed cartridge design keeps out dirt and moisture, providing a maintenance-free solution that stands up to challenging conditions.

Optimized for Chaincases: Specifically designed for chaincase systems, this bottom bracket is a great choice for bikes with enclosed chain setups. It ensures smooth drivetrain operation while offering protection against environmental elements.

The Shimano BB-UN300-K is user-friendly, with straightforward installation for mechanics and DIY enthusiasts alike. Whether upgrading or replacing, it offers excellent performance and reliability for square taper cranksets.