Bolany Moutain Bike 9 Speed 40T Card Flywheel Gear Box Bicycle Cassette Flywheel Accessory

Feature: 1. Bicycle flywheel has high temperature resistance, corrosion resistance, rust resistance, wear resistance, strong impact resistance, high tooth shape. 2. The use of hollowed out design, while reducing weight, but also can increase the speed. 3. Excellent replacement accessory for mountain bikes and road bikes, easy to install without any adjustment. 4. Adopt high quality chromium‑molybdenum steel material, firm and durable, provide longer service life. 5. Fashionable color match design, can make your bike looks cooler. 6. With 9 Speed, 11‑40T specification, and 11‑13‑15‑18‑21‑24‑28‑34‑40T teeth number. Specification: Item Type: Bicycle FlywheelMaterial: Chromium Molybdenum SteelWeight: Approx. 468g 16.5oz Color: Silver+BlackQuantity: 1PCSSpecification: 9 Speed, 11 40TSmall Teeth: 11TNumber of Teeth: 11 13 15 18 21 24 28 34 40TLarge Tooth Black Part: 40T. Package List: 1 x Bike Flywheel