Adopt anodized oxidation treatment in the surface layer to prevent the rear derailleur wheel from rusting and oxidation. With the characteristics of anti-deformation and wear-resisting, it is sturdy and durable and has a long service life. With deep tooth design, the rear derailleur guide wheel can fit closely with the chain, reducing chain wear, not easy to drop the chain, and improving transmission efficiency. Made of premium aluminum alloy and metal material, the rear derailleur is high hardness and corrosion resistant. There are three different sizes for you to choose: 11T, 13T, 15T. Universal for mountain bikes, road bike, folding bike, etc. Item Name: Rear Derailleur Wheel Material: Aluminum Alloy, Metal Features: High Strength, Anti-rust, Corrosion Resistant Size Details: 11T: Diameter: 3.4cm/1.34" (Approx.) 13T: Diameter: 5.1cm/2.01" (Approx.) 15T: Diameter: 6cm/2.36" (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 Set of Rear Derailleur Wheel Note: 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. Sold by-Dadangjia