ZTTO MTB Bike Freewheel 9 Speed 11-40T Bicycle Cassette Sprocket Accessory, 501 Original

Features:Suitable for 9-speed MTB.If the flywheel wears out, he will not be able to provide good shift control. Even make terrible noise under pressure, and even accelerate the wear and tear of the chain. Then you need to buy a new flywheel.Specifications:Material: SteelColour: Silver + BlackMain body size: 165x165x30mm/6.5*6.5*0.47\"Net body weight: 511gNumber of teeth: 11-13-16-20-24-28-32-36-40TNote:Please allow 1-3mm differs due to manual measurement.Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!1 x Freewheel