18 Teeth Bike Freewheel Chain Sprocket One Speed Bicycle Replacement Accessory

Features: Made of high quality metal, corrosion resistant, high performance and durable. Smooth rotation without too much noise. High precision internal thread, ensure tight connection with bicycle hub, smooth operation. Provides fast cycling speed and reduces the amount of work required. Lightweight and small, easy to install on your bike. Specification: Condition: 100percent Brand New Material: Metal Color: as picture shown Diameter: approx. 7.8cm/3.1inch Package list: 1 x Freewheel.