The radial, of comparable size, provided you can hook it, will be faster than the bias tire, every time. The radial tire construction, is simply better. Yes the sidewall is stiffer, but the tire as a whole is stiffer. The tire stays more "round" during the run, which is quicker and faster. We run both slicks and radials. With identical tune ups and identical 60fts, the 330 and 660 numbers, are quicker with radials, EVERY time.
