Description: Providing strong chain stabilization, the tooth profile design ensures the smoothness and stability of the chain when riding at high speed. With the anodizing and sanding treatment, there will be a film formed on the chainring surface to greatly increase the oxidation resistance. The chainring adopts a lightweight hollow design and a one-piece forged shape, and its shift pin makes the entire shifting process stable and not easy to lose the chain. Made from 6061 aluminum alloy, the product is durable and high strength. The diameter of the inner disc is 13 cm. It supports 8/9/10/11 speed shift system, which is suitable for long-distance cruisers who can maintain a speed of 30+km, and also suitable for power players to burst sprints. Item Name: Biking Chainring Material: 6061 Aluminum Alloy Specifications: 39T-53T Features: High Strength, Wear-resistant, Labor-saving Size Details: Inner Disc Diameter: 13cm/5.12" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Large Biking Chainring 1 x Small Biking Chainring