1. Material: aluminum alloy
2. Application: support 8 speed, 9 speed, 10 speed, 11 speed
3. Specifications: 39T-53T
4. Aluminum alloy 3D one-piece forging, lightweight hollow structure
5. Waterproof and rustproof, long service life
6. Shift pin, not easy to drop the chain
7. Guide chain groove design, smooth shifting
8. Weight: 153 grams
9. BCD: 130mm
