Topeak Defender M1For 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. A stiff engineering grade polymer support frame is comolded to a softer more flexible material at the trailing edge for greater durability. A highly polished underside helps prevent dirt buildup and aids in cleaning.