Shimano BB-UN300 Bottom Bracket - English, 73 x 118mm Spindle, Square Taper JIS

Designed for frames with a 73mm shell, this Shimano BB-UN300 bottom bracket features a 118mm hollow spindle to keep weight down while delivering dependable crankset support. It is threaded for English bottom bracket shells with a 1.37-inch inner diameter and pairs with JIS square-taper cranks.

Finished in black, this unit threads securely into your frame to provide smooth, reliable rotation on every ride.

• Frame Interface: English threaded (1.37" I.D.)
• Shell Width: 73mm
• Spindle Length: 118mm
• Spindle Type: Hollow, Square Taper JIS
• Crankarm fixing bolts sold separately