Over the past three years, we have tested a variety of different tires with our MetalCloak fenders. First it was a set of 37x12.50 BFG Krawlers. Then we installed a 37x13.50 Mickey Thompson Baja Claw. Next, it was a 40x13.50 Goodyear MT/R, and today it's a 40x13.50 ProComp Xterrain as seen here. The 40-inch rubber would not have been possible without MetalCloak's original arched front fender conversion.