Surly Track 3/32in Sprocket

Precision CNC Cro-Mo Sprocket. Wear resistant hardened 4041 material.Note: General fixed sprocket check:For correct fixed use, the fixed sprocket should never move on the hub when pedal force is applied in both directions.ie If the sprocket moves, then something is wrong.Continued use with a fixed sprocket that moves will result in damage to the hub