1、1. New upgrade: The new quick-dismountable bike rear shelf and the disc brake V-brake universal shelf can be applied to 24-29 inch mountain bikes. 2、2. Adjustable side wings: Come with tools and installation instructions, the size of the main body of the bracket can be adjusted, adjustable side wings, and the support can be expanded to firmly fix the cargo. 3、3. Easy to install: Easy to install and disassemble, very suitable for use with banners, backpacks, baskets, etc.! The triangular structure of the fixed structure is stable in force, strong in carrying capacity, strong in shock resistance, strong enough to carry heavy luggage and people with a weight of about 75 kg. 4、4. Sturdy: The actual 90kg load-bearing, sturdy alloy steel frame is suitable for V-shaped brakes and disc brakes. 5、5. Safety: There are reserved holes for rear reflectors, you can assemble your favorite reflectors or lights to ensure safe driving at night. Material: Aluminum alloy Colour: Black Size: about 47 * 13.5 * 21cm Load-bearing: about 90kg (recommended to carry people within 75kg) Applicable: Sitting tube caliber <32mm or> 32mm is available 1 * Bike frame 1 * Installation tool 1 * High-strength elastic rope