The 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. Engineered manufactured and assembled in Portland Oregon USALegendary King made-in-house angular-contact bearingsFully serviceable and backed by the King Lifetime Warranty this bottom bracket will outlast your bike TECH SPECS table{border-collapse:collapse;width:100%;} td{text-align:left;padding:8px;font-weight:350;} tr:nth-child(even){background-color:#f2f2f2} th{background-color:#eb212e;color:white;text-align:left;padding:8px;} .desc .specs-heading{font-size:24px;font-weight:600;padding-top:35px;border-top:3px solid #f0f0f0;display:inline-block;border-bottom:4px solid #eb212e;width:142px;margin:0;} Bottom Bracket Shell I.D. 1.37 BB/Frame Interface English BB Shell Width (mm) 73 Spindle Interface Type Shimano Hollowtech II Defined Color Black Fit Kit Number 4 Compatibility Shimano Hollowtech II Color Finish Black