Quote:
Originally Posted by 07BlueBeastGT
i have an 07 GT 5spd i wanna put 18 x 9.5 rims on it over the stock 17 x 8's. does anyone kno what i would have to set the revs to on the xcal for my speedo to be exact?... tires im gonna use are 275/40-18
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New tires should be the same total height as the old ones so that this isnt an issue.