Material: It is made of high quality aluminum alloy, durable and solid. It is suitable for most bicycles, such as road bike, mountain bike, fat bike. Load Capacity: 110Lb capacity, durable alloy steel bracket. For V Brakes and disc brakes. Dimension: Shelf length 55cm, width 14.2cm (21.6 x 5.6 in), panel length 35.5cm, width 14.5cm (13.9 x 5.9 in). It is adjustable for many types of bikes. Easy to mount. Practical: With the side protection frame, your luggage is protected from being scratched by the wheel or spokes. Secure: Includes a rear red reflector lamp and elastic cords, which can make you safer to ride at night and keep your luggage safe.