SSR Professor SP1; F: 255/35 18x8.5 +25; R: 285/30 18x10 +37. The rear is dead on. When I first installed, I was contemplating a 5mm spacer up front to push the tire a tad out. Now that it's lowered, it's dead on. In fact, I may have to buy slightly taller tires for rear - 285/35 maybe, if it even exists.