DeFenderTM M1 is compatible with all standard front forks including reverse arch designs, the unique quick release attachment system integrates the DeFenderTM M1 seamlessly with the front of your bike. DeFenderTM M2 has an ultra-secure quick release mounting system that easily adjusts from 25.4 to 34.9mm, easily fitting standard and oversized seat posts. The two-pivot arm articulates for improved tire coverage and perfect bike fit. A stiff engineering grade plastic 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.