The Wheels Manufacturing BSA 30 bottom bracket is designed to allow the use of 30mm spindle cranksets in frames with English (BSA) threaded bottom bracket shells. This solution features high quality aluminum cups and fully serviceable bearings for reliable performance. This bottom bracket is compatible with frames that have 68-73mm English bottom bracket shells and requires a 30mm diameter crank with an overall spindle length of at least 104mm when used in a 68mm wide BB shell. It is not compatible with standard BB30 cranksets, so users should measure their BB30 crank spindle length before purchasing.