Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS

Upgrade your bike's performance with the Shimano BB-UN300 Bottom Bracket, designed specifically for English 73 x 123mm spindle square taper JIS cranksets. Engineered for durability and smooth operation, this bottom bracket ensures reliable power transfer and long-lasting performance for riders of all levels.

• Compatible with JIS square-taper cranksets for a secure fit
• Note: Crankarm fixing bolts are sold separately to allow customization
• Features a hollow spindle to reduce weight without compromising strength