I have 17x7 with very little problems, just some rubbing in the rear on hard bumps or with the car fully loaded and people and the speedo is dead on. I checked the speed on the highway at 75 with another accent (matt 1840, were the hell are you?) on stock rims and he was going the same speed. The rims are wrapped in 205/40 tires. Now you say your rims are 7.5 wide so I do see a problem with the width as my 7 inch wide rims hardly fit.