We are an experienced bicycle accessories manufacturer. For us, the first task is to provide customers with reliable products and highquality services. We constantly strive to improve our products. All products are tested and screened by professional athletes,We have own factory for MORE THAN 20 years with professional experience,We can reduce costs better and control the quality strictly. Product DescriptionProduct Name: Truck flywheel for mountain bikeModel: CSHG2007Speed: 7 / 21 Number of teeth: 1228T/32TRemindIf: If it is used in 8speed or 9speed flower drum, two 2mm washers need to be added, otherwise the foundation of Flower Drum Tower is too long and the flywheel cannot be fixed. Box Contains 1 x Cassette 2 x washer