Fieros ive had handled so well, i thought it was worth the little bit of performance loss to go to a taller, like 70 series tire. They fill the wheel opening better and ride great. I was born in the muscle car age when you wanted a big tall tire. You can correct things like a missreading speedo. My V8 (cast iron heavy) fiero with 70s on 15" rims rode like a Cadillac and still handled better than most newer cars.