Welcome to ZTTO Official Store! Item Name: Bicycle Flywheel Material:Steel Gear Ratio: 12-14-16-18-21-24-28-32T Size:14.5cmx14.5cmx5cm/5.71inx5.71inx1.97in Description: Hollow design reduces the weight and there is no extra problem on the bicycle. Because of strong oxidation resistance, the product is difficult to rust and has a long service life. And it is strong, durable and wear-resistant. It is made of steel material and the surface is treated with nickel and chromium, which make it durable. The length of the product is 14.5cm, the width is 14.5cm, and the thickness is 5cm. It is suitable for mountain bikes. 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