Because everyone that had gone square has loved it and never mentioned a stability issue, I hadn't thought of that. I have to say other then adding an extra psi or two to the rear it probably won't make much difference. However I have not tested it. I am running 27s with no problems though and if..if I ever need new tires, I will be going square and sticking with the 27s...and keeping my 1.5" spacers on if I can't get the offset I want.