My '53 6400 has 8.25-20 bia tires on it and they are plenty big on the front. I can see where the tires rub if the wheels are turned really tight. As long as bias ply tires are fresh they and have a proper load rating there is no reason that they are of a lesser quality than a radial tire. If you don't want to replace your wheels at this time your money is best spent on getting good bias ply tires for the rims you have.