FJQXZ Bike Bicycle Fender Set for Mountain Bike Bicycle Front and Rear Mudguard (Blue) The bike fenders are made of high elasticity material, can be twisted freely, not easily broken, quite strong, extremely durable Quickly and easily install and disassemble (Rear fender angle is adjustable) The fender set is compatible with mountain bikes with standard front forks including reverse opening designs The front fender with 4 sizes expandable nuts, fits the front fork reserve opening diameter of 0.7"(1.8cm) to 0.9"(2.4cm); The rear fender with quick release mounting design, fits the seat tube circumterence dimension of 3.1"(7.9cm) to 4.2"(10.7cm) Front Fender Arc Length * Width = 24" * 3"; Rear Fender Arc Length * Width = 22" * 3"