Features: This freewheel was used on race bikes with or without deraiuller Needed to complete that old school bm bike Suitable for Fixed Gear Bike,single speed flywheel,removable Specification: Material: Steel Color: Brown Size: as shown Gear Teeth: 16/18/20T Package included: 1 x Single Speed Freewheel Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Superior-quality-This accessory parts, made of durable materials, are durable and not easy to wear or damage, ensuring long-term stable cleaning results and long-lasting service life. Easy to Install-The installation is simple, and the accessory is easy to install and replace. Fine Manufacturing-Precise processing and adjustment ensure that each parts are consistent, improving the machine. Well design-user friendly design allow you to quickly install them onto yours, ensuring a secure fit and saving valuable time during maintenance. Excellent After Sales Service-We focus on quality and after-sales service. If you are dissatisfied with our products, please let us know. We promise to give you 110% satisfactory after-sales service. No risk. Don't hesitate. Just buy it.