High - quality Materials The rear bike rack is made of an improved high - strength aluminum alloy, which is more corrosion - resistant and sturdy. It doesn't easily deform or bend under extremely high loads. High - quality The actual maximum load is 75KG. However, the label indicates 25KG. This is because this luggage rack has passed the 25KG load - bearing test at a professional testing station. (Only the maximum 25kg test is provided.) Semi - Quick - release Bike Rack The improved seat post clamp with a quick - release can be installed quickly without tools, making it portable and stable. The enlarged side guide plank structure can prevent items from rolling into the spokes. The adjustable support rod features a screw - locking method for easy length adjustment. Suitable for Most Bicycles Our MTB bike rack is 51 cm long and 14.5 cm wide; the board length is 35 cm; the width is 14.5 cm, and it weighs only 1 kg. It can be attached to seat supports under 32 mm and is suitable for most bicycles, such as road bikes, mountain bikes, etc. (Note: Children's bikes and folding bikes cannot be used.) Package Includes a. Free installation tools; b. A free bungee cord that allows you to securely fasten your luggage on the bike rack, enabling you to carry more luggage. c. A free reflector that is very easy to install and remove, making night rides safer.