Bottom Bracket Adapters

We have threaded adapters for any width bottom bracket from 68mm to 120mm for most press-fit standards. If you have a 68 or 73mm bottom bracket you may have the best results with the one-piece adapter. PF42 refers to the 42mm inside diameter of the shell. PF42 is used in BB30, BB30A, BB30AI, and BBRIGHT™ DIRECT FIT bottom bracket types. PF46 refers to an inside shell bore diameter of 46mm. PF46 (PF30, PF30A, PF30AI, BB386EVO, OSBB, BBRIGHT™ PRESS FIT bottom bracket types. PF41 BB shells have a nominal 41mm inside diameter.  PF41 (BB86, BB89.5, BB92, BB107, SHIMANO® PRESS-FIT, PF24 bottom bracket types. Eccentric BB Adapter - American (Ashtabula) BB shells 51.3 mm (2.02") inside diameter. These are typically found in older American-made bikes and American children's bikes.  Some cruiser bikes for the American market still use this style. Note: (Adapt your bottom bracket to the BSA/JIT English threaded type that mid-drive motors require. Most bikes that originally sold for less than $150