High Performance: The 10 Speed 30 Speed Mountain Bike Flywheel 110s 11-42T offers exceptional performance for mountain biking enthusiasts, ensuring smooth gear shifts and optimal power transfer. Versatile Compatibility: This is designed to be compatible with both and systems, making it a versatile choice for bike setups and riders' preferences. Construction: Crafted from high-quality materials, the 10 Speed 30 Speed Mountain Bike Flywheel is built to withstand rigorous riding conditions, providing long-lasting durability and reliability on any trail. Range of Gearing: With an impressive 11-42T gear range, this racing version flywheel allows for improved climbing efficiency and top-speed capabilities, enhancing your overall cycling experience. Easy Installation: Designed for user-friendliness, the 10 Speed 30 Speed Mountain Bike Flywheel can be easily installed on your bike, allowing you to upgrade system without hassle. Colour:As Shown Material:steel Package Contents: 1 * Cycling Gear Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.