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Originally Posted by qoncept
I'd say 3% is pretty close. Pax shows a difference of about 1.5% between the classes but as has been said, CSR has a soft pax and CS seems to be a little too high.
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The comparison would be an STX (without power mods) with R-compound tires against an RTR/CS with street tires.
How much faster is STX compared to RTR?
(That plus the 1.5% may give the approx. total potential difference.)