Topeak DeFender M1 & M2 Mountain Bike Fender Set (26-Inch Wheels) The DeFender M1 is compatible with all standard front forks including reverse arch designs DeFender M2 has an ultra-secure quick release mounting system, two pivot arm articulates for improved tire coverage and perfect bike fit A stiff engineering grade plastic support frame is co-molded to a softer more flexible material at both ends for greater durability Adjusts from 25.4 to 34.9mm