I wouldn't say it weakens it. It's an irreversible change. Don't get me wrong, I beat my cars. 428's, 455's, Nitrous Oxide, traction bars, bolt-in sub-frame connectors. All with tires that fit. I tried the huge tire thing and it just slows down the car. It's a physics thing. You want to keep the weight down in the rotating unit. It subtracts directly from horsepower. The bigger the tire and wheel the more weight. The more you raise the rear end the less weight transfer to the rear tire, less traction. Big whopping tires are only good for looks.