【Robust with a 25 kg Capacity】 The ROCKBROS rear bicycle rack features a scientific load - bearing structure, six extensions, and a triangular - stabilized framework. This results in a highly stable rear bike rack capable of supporting up to 25KG of weight (make sure to tighten the screws firmly). It's perfect for your needs, allowing you to effortlessly transport bicycle bags, bike accessories, and other items, or even a second person on the back of your bike. 【Easy to Install】 The bicycle rear rack comes with a complete quick - release function. It is pre - equipped with everything required for installation. With the provided tools and parts, installation can be completed quickly. We recommend watching the installation video before starting to simplify the assembly process. 【Universal Fit and Easy Adjustment】 The aluminum - alloy bicycle rack has adjustable struts, making it suitable for a wide variety of bike frames. As a result, it's compatible with most bicycles, such as e - bikes, city bikes, 26 - 29 - inch mountain bikes, fat bikes, etc. 【Humanized Design】 The red rear reflector enhances visibility during night rides. Additionally, we've extended the side wings of the bike luggage rack to effectively prevent friction between legs, bags, etc., and the wheels, thus improving riding safety. It comes with a bungee cord, and the rear bike rack offers sufficient surface area to secure all kinds of items. For frame protection, we provide silicon pads for the areas where the clamps are located. 【Further Details】 a. The tube diameter is thickened; the thickened tube diameter is approximately 10.37 mm, making it more durable. b. The seat plate is widened and enlarged to prevent the load from falling off. c. It is waterproof and not prone to rusting. d. Install the side guards upwards, which can be used as a basket to prevent items from falling on both sides. e. It comes with a reflector to ensure safe night riding. Note: The luggage rack cannot be installed on a carbon fiber frame to avoid frame breaks and damage.