Bike Cassette Cog MTB Road Bike Freewheel Sprocket Cycling - 11T & 9S

With this replacement cog you just need to change the outwornone ratherthan the whole cassette and please sure theteeth and speed of your cassette to fit the cog before order.Feature:High duty steel construction strong and wear resistant.Designed for shifting performance.For road bike and mountain bike.Specification:Material: Stainless steelTeeth: 11T / 13T (optional)Speed: 8S / 9S / 10S / 11S (optional)Package weight: 12-21g / 0.4-0.7ozPackage list:1 *Bike Cassette Cog