aluminum alloy structure, excellent construction, not easy to rust, light weight and no burden, can withstand up to 30 kilograms of weight. Adjustable bracket and bottom pole, suitable for most bicycle frames (including road bikes/mountain bikes/electric bicycles). It allows you to transport goods easily and efficiently, and can be equipped with multiple types of bicycle bags (including bicycle tail bags, front fork bags, and large capacity pack bags). Suitable for matching different styles of backpacks in different scenarios, it can be used for both and heavyweight cycling. The installation is smooth and the driving is stable without shaking. After installation, it remains stable without shaking or swinging, and is quiet without making any noise. Protect your luggage and bags from scratches on the wheels or spokes.tion. Load bearing: It is easy to bear a weight exceeding 30 kilograms Color: As Shown Material: Aluminum alloy Package Contents: 1 x Rear Rack Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.