Features1Constructed from Aluminum Alloy: This flywheel is built to withstand the test of time. Its properties ensure that it remains rustfree, making it a durable and long lasting choice. 2Experience a Smooth and Noise Free Ride: The high accuracy internal threading guarantees a tight and secure connection with the bicycle's wheel hub, providing a seamless rotation experience. 3Reducing the Burden: Hollow design allows for easy weight reduction, reducing the burden of cycling. Achieves a nice balance between strength and weight. Easy installation and usage, making it an ideal choice for reducing bicycle weight. 4Designed for Electric Bicycles and Assisted Bikes: This flywheel features a 10 speed 1250T cassette, allowing for versatile and efficient gear shifting. With this flywheel, you can tackle various terrains with ease, enhancing your overall cycling performance. 5Exceptional Design: Its exceptional design and nice craftsmanship contribute to a reliable and efficient component that enhances your riding experience and ensures optimal performance throughout your journey.SpecificationItem Type:10SpeedCassetteFlywheelWeight: 749g/26.4ozMaterial: Aluminum alloyPackage List1 x Flywheel3 x Tooth Plate