Feature: 1. The flower drum is tightly fixed with accuracy thread, and the thread polished by accuracy machine tool is clear and firm 2. Flywheel and flower drum are closely combined to make riding more comfortable and smooth 3. The movable flywheel rotates gently and runs smoothly. There is only a slight tick sound during operation 4. 24T movable flywheel is mostly suitable for single speed, ordinary, BMX Bicycle, folding bike, tricycle 5. Smooth and powerful operation, deep lubrication, smooth and labor saving riding. Let you ride happily Specification: Item Type: Bike Freewheel Material: Steel Process: Fine Quenching, Special High Tensile Steel, Brown Chrome Plating Thread Inner Diameter: Approx. 34mm 1.3in Number of Teeth: 24T Applicable: Single Speed , Ordinary , For BMX Bicycle , Folding Bike , Tricycle. Package List: 1 x Bike Freewheel Note: Please allow 0 to 2 cm error due to manual measurement. Thanks for your understanding.