Chris King ThreadFit 24 bottom brackets are designed and built to be durable, serviceable, and silent. Bearings can be serviced with the Chris King Grease injector tool. King made-in-house bearings King Lifetime warranty Included Fit Kit #4 is designed to mate the ThreadFit 24 bottom bracket with a 24mm spindle Specifications Bottom Bracket Shell I.D. 1.37 BB/Frame Interface English BB Shell Width (mm) 68 BB Shell Width (mm) 73 Spindle Interface Type Shimano Hollowtech II Defined Color Black