The Shimano BB-UN300 is a sealed bottom bracket designed for square taper cranksets. This genuine Shimano component provides a reliable and stable interface for your bicycle's drivetrain.

• Sealed Design: Features a sealed construction to maintain smooth rotation and protect internal components from the elements.

• Square Taper Compatibility: Specifically engineered for use with square taper spindles, ensuring a secure and traditional fit for compatible crankarms.