700C Track Mach 1 Omega Rear wheel track hub nutted with 16t fixed sprocket, built onto Mach 1 Omega white rim which is double wall for strength with a machined brake surface. This hub is double treaded to take a fixed or freewheel sprocket (flipflop). Finished with black spokes. This wheel is ideal for the track or commuting rider on a budget. Hub is alloy with a nutted axle and will require a 120mm wide drop out width to fit your frame (could be spaced wider if needed).