Description: Fine workmanship makes it practical and sturdy. Integrated riveting technology makes it have more balanced force and more efficient transmission. With high machining accuracy internal thread, it can ensure a close connection with the bicycle flywheel and smooth operation, providing fast riding speed with less energy. Made of high quality steel material, the product is wear-resistant and durable. The speed of the flywheel depends on the number of rows of teeth on the flywheel. There are 7 rows for 7 speeds, and 8 rows for 8 speeds. The length of the product is 5.3cm, the width is 5.3cm, and the thickness is 0.5cm. It is compatible with various brands of cassette flywheels. Item Name: Flywheel Repair Gear Material: Steel Specification: 11T Color: Silver Color Features: Wear-resistant, Durable, Strong Speed: 8-speed, 9-speed, 10-speed, 11-speed Process: Nickel Plating + Heat Treatment Hardened Size Details: 5.3cm x 5.3cm x 0.5cm/2.09" x 2.09" x 0.20" (Approx.) Notes: Due to the light and screen setting difference, the item'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 Teeth