Description: The gear sprocket is specially designed for mountain bikes,which can control the speed change function well. The exquisite appearance gives you a luxurious feeling. Its gear ratio is 11-13-15-18-21-24-28-32T. Strong oxidation resistance makes it difficult to rust and has a long service life. It has higher strength, durability and high wear resistance. The speed is 8. Made of steel material, the bicycle flywheel is durable. The length of the product is 13cm, the width is 13cm,and the thickness is 6cm. It is suitable for mountain bikes. Item Name: Bicycle Flywheel Material:Steel Speed Difference: 8-speed Size:16cmx16cmx6cm/6.3inx6.3inx2.36in Notes: Due to the light and screen setting difference, the product's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Bicycle Flywheel