For 26\" Wheel DeFender™ M1 is compatible with all standard front forks including reverse arch designs, the unique quick release attachment system integrates the DeFender™ M1 seamlessly with the front of your bike. DeFender™ M2 has an ultra-secure quick release mounting system that easily adjusts from 25.4 to 34.9 mm, easily fitting standard and oversized seat posts.The two-pivot arm articulates for improved tire coverage and perfect bike fit. A stiff engineering grade polymer support frame is comolded to a softer more flexible material at the trailing edge for greater durability and a highly polished underside helps prevent dirt buildup and aids in cleaning. Fits MTB 26\" tires.Quick release for front and rear,Fits 25.4mm to 34.9mm seatpost,230g (Front), 190g (Rear).