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I've been told street tires need a bigger (longer) burnout to put heat in them since they are a harder compound....makes sense to me I guess.

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Did a tire salesman tell you that? Most street(not drag race radials) radails don't like burn outs I have seen a lot of successful street class racers go around the water and not do any burn out at all and still win races, round after round at the local track I guess it is one of those things that you have to try on your combination to find out what works and what doesn't I do run both the M/T ET Street Radials and the ET Street bias plys on my car, the radials are faster than the bias ply tires on a good track and not as good as the bias ply tires on a bad track