BSD Superlite BMX SprocketThe original BSD sprocket, now in it's 23rd year of production, the amount of teeth may have changed over the years but the classic tri spoke look hasn't.. Fully CNCd dual thickness sprocket Super tough 7075 T6 construction 8mm thick at the edges for strength Tapers to 6mm at the center to save weight Centre hole 24mm, supplied with both 19mm and 22mm top hat washers to fit all cranks