Welcome to our store！</br> 1、The flywheel is made of high strength steel plate, and the spindle is made of aluminum alloy, firm and durable. 2、Anodized surface, which significantly improves the corrosion resistance, hardness and wear resistance of the flywheel. 3、Hollow design can easily reduce the weight, reduce the cycling burden, and achieve a good balance between strength and weight. 4、Split structure design makes it easy to install and disassemble, simple to clean. 5、Fit for 9 sdpeed and 11‑46T mountain bike, special surface coatings provide protection in all harsh conditions. <p class="wang-edit-text">Item Type:&nbsp;9&nbsp;Speed<span style="font-style: italic;">​</span>​&nbsp;Split&nbsp;Flywheel Material: High Strength Steel Plate+Aluminum Alloy Support Weight: Approx. 490g/17.3oz Color: As picture shown Speed: 9 speed Number of Gears: 11-13-16-20-24-28-32-36-46T <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x&nbsp;Bike&nbsp;Flywheel Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>