Economic and functional Fixed Sprockets.CNC machine finished from pressed hot rolled mill steel plate.Consistent and durable.Narrow 3/32" teeth (can run on 1-9speed chains)Fits regular 1.37" x 24Tpi. hubs.Chrome plated finish.13T- 26g14T - 32g15T - 40g16T - 48g17 - 57g18 - 64gNote: General Fixed sprockets check: for correct fixed use, the fixed sprocket should NEVER move on the hub when pedal force is applied in both directions.i.e. if the sprocket moves, then something is wrong.Continued use with a fixed sprocket that moves will result in damage to the hub.