1PCS MTB Road Bike Freewheel Cog 8 9 10 11 Speed 11T 12T 13T Bicycle Cassette Sprockets Accessories For Shimano SRAM Description: *1. Material: chrome molybdenum steel *2. Specifications: 8-speed -11T/ 8-speed -12T/8-speed -13T ? ? ? ? ? ? ? ? ? ? ? ? ? ? 9 speed -11T/ 9 speed -12T/9 speed -13T ? ? ? ? ? ? ? ? ? ? ? ? ? ?10 -11T/10 -12T/10 -13T ? ? ? ? ? ? ? ? ? ? ? ? ? ?11 -11T/11 -12T/11 -13T *3. Dimensions: 11T/12T/13T inner diameter 3.5cm/3.8cm/4cm *4. Weight: about 10g/15g Features: *1. Made of chrome molybdenum steel, lightweight and durable. *2. The new design of narrow and wide teeth increase the holding force of the chain, long wear life and low noise. *3. Larger wide tooth design provides maximum durability and dropping performance of gear ring. *4. Easy to install and disassemble, suitable for highways or mountainous areas. *5. Suitable for Shimano mid-range or long-range derailleur. Not suit for highway bikes. Package Includes: 1x Freewheel Note: *1. Please confirm whether your flywheel can be used before purchasing. Please purchase it as required. *2. All pictures are professionally color-coded, but due to the difference of ambient light and display equipment settings, there may be some deviation between the pictures you see and the objects themselves, please understand. *3. The data is measured manually, and there may be some deviation, but it does not affect the use.