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Yes, I run 15s because we have (still) good tyre choice in that size. This is what I alluded to above - if the gun tyre is brand X, you are locked into those sizes available, otherwise you have to take the laptime/tyre life penalty. You then build your suspension around the size you select. I'd go with 15s over 14s any day, because of the larger contact patch, and your power will dictate the width - big hp turbo/V8 as wide as you can, at least 8s, 1.5l atmo, 6-7.
Take this with a grain of salt, I am not racing where you are racing and I am not racing your car. Again, look around, talk to the tyre people.
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