These locking rings are compatible most center lock disc brake rotors. This versatility allows you to upgrade or replace your braking system easily, ensuring you have the best performance for both mountain and road bikes. These locking rings are compatible with 15mm and 20mm thru-axles, model DS03, making them suitable for a wide range of bicycle setups. This compatibility ensures that you can use them across different bike models and setups without hassle. Measuring 44mm x 26mm x 8mm, these rings fit perfectly with your center lock hub. Made from aluminum alloy, these center locking rings are lightweight yet incredibly strong. Easy Installation,Designed to be used with a center lock adapter, these locking rings can be easily installed on your bike’s hub.