I was wrong, the front is the same size, the rear dunlop is only 1.5mm diameter taller. This should be a non issue. Pirelli recommends anything from 30-35 in the front off the warmers. I would guess something with the suspension is causing it. I have always ran around 27, anything lower never seams to work for me. If it works go for it but my tires always look like shit if I go lower than 25.