Velo Orange Eccentric English Threaded BB. Features: Bike with vertical dropouts can be converted to single speed Made from single-block CNCed aluminum, these bottom brackets are designed to be used with any 24mm spindle, 2-piece cranksets, such as Shimano Hollowtech II, FSA, SRAM GXP, and many other Includes spacers to dial in pre-load, a GXP shim, a wave washer for the arm spindle side, and a tool that doubles as a chain tensioner / lockring wrench Specs: Model:Eccentric Spindle Interface:24mm Shell:BSA Shell ID:- Width:- Color:Black