Shimano BB-UN300 Bottom Bracket - English 73 x 113mm Spindle Square Taper JIS

Discover the Shimano BB-UN300 Bottom Bracket, engineered for reliable performance and seamless compatibility. Designed with an English 73 x 113mm spindle and a Square Taper JIS interface, this bottom bracket ensures a precise fit for your JIS square-taper cranksets, delivering smooth pedaling efficiency on every ride.

• Perfectly compatible with JIS square-taper cranksets for easy installation
• Hollow spindle design reduces weight while maintaining strength
• Crankarm fixing bolts are sold separately, allowing customization