[TransamGTA350]

If you already have a set of 315/30R18 Vitours for the front, go ahead and run them along with the 345 Vitours in the rear. You’ll probably find though with a 30mm stagger front-rear that the handling dynamic will favor understeer. If you’re newer to road course driving, that’s fine as it’s a safer setup. If you’re more experienced, you may prefer a more neutral balance, in which case running a square setup may be more beneficial.

You can play with tire pressures front to rear (run 2-3psi higher rear than front), which will loosen up the rear a little bit, but that’s more of a fine tuning tool.

Also, just be careful on the Vitours now that the weather is getting cooler. The 1st few laps in the morning are pretty sketchy until they warm up. Max grip on the Vitour P1’s are pretty good once they are hot, but they definitely need a good amount of heat to come alive.

The new Vitour P1X that’s coming out should activate at a lower temperature, similar to an RE71RS or AO52.