I have ran both types on my Duster on the street and at the track, 315x60x15 ET Street Radials and 13.50x30x15 ET Street The radials are faster on a good track not as good on the street if the bias plys are at low pressure. I pump the ET Streets up to 20 lbs on the street and run them at 9.5 to 11.0 lbs at the track or when it is time to hook it up I did find out the hard way to not mix the bias and radial tires together on the street Not so at the track My car wants to wonder all over the road on the streets when I mixed the bias with the radials, it didn't matter which was on the front or rear Bias with bias and radials together