Shimano BB-UN300 Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS 50mm Chainline

Experience reliable performance with the Shimano BB-UN300 Bottom Bracket, designed specifically for English-threaded frames with a 68 x 122.5mm spindle. This bottom bracket features a durable square taper JIS spindle and a precise 50mm chainline, ensuring smooth and efficient power transfer for your ride.

• Compatible with JIS square-taper cranksets for versatile use
• Note: Crankarm fixing bolts are sold separately to allow customization
• Equipped with a hollow spindle to balance strength and weight savings