some more food for thought on those tires... i ran them for 3yrs, loved them, not the best on rocks cause the tread is only 7.2 wide i believe but the point is they are lighter than your wider 31's, so this reduces your overall rotational mass. for ex when i had these the weight was 47lbs per tire, my new tires are an inch taller and weigh in at 57lbs each, the difference in power is notable.