Material: It is made of high quality aluminum alloy, which is durable and strong. It is suitable for most bicycles, like road bike, mountain bike, fat bike. Load Capacity: 110Lb capacity, durable alloy steel bracket. For V Brakes and disc brakes. Dimension: shelf length 55 cm, width 14.2 cm (21.6 x 5.6 in), panel length 35.5 cm, width 14, 5 cm (13.9 x 5.9 in). It is adjustable for many types of bikes. Easy to fit Practical: With the side protection frame, your luggage is protected against scratches by the wheel or the spokes. Safe: Includes a red rear reflector lamp and elastic cords, which can make you safer to ride at night and keep your luggage safe.