Feature:1. The flower drum is tightly fixed with accuracy thread, and the thread polished by accuracy machine tool is clear and firm2. Flywheel and flower drum are closely combined to make riding more comfortable and smooth3. The movable flywheel rotates gently and runs smoothly. There is only a slight "tick" sound during operation4. 24T movable flywheel is mostly suitable for single speed, ordinary, BMX Bicycle, folding bike, tricycle5. Smooth and powerful operation, deep lubrication, smooth and labor saving riding. Let you ride happilySpecification:Item Type: Bike FreewheelMaterial: SteelProcess: Fine Quenching, Special High Tensile Steel, Brown Chrome PlatingThread Inner Diameter: Approx. 34mm / 1.3inNumber of Teeth: 24TApplicable: Single Speed , Ordinary , For BMX Bicycle , Folding Bike , Tricycle.Package List:1 x Bike FreewheelNote:Please allow 0 to 2 cm error due to manual measurement. Thanks for your understanding.