I have a 2001 911 turbo that came with larger SSR GT3 wheels. I would like to put the widest tires possible on them, maybe 315's. I understand that the diameters of the tires must be close between the front and the rears, and that I would likely need go wider evenly on the fronts and the backs to maintain even handling. So the stock tires are 225/40/19 295/30/18. So I am assuming that the correct size I am looking for would be 245/35/19 and 315/25/19. Let me know what you think.

 

Ok I figured out that these rims need 235/35/zr19 and 315/25/zr19 tires. I have decided to sell these rims, I don't want to pay this much for tires. See for sale section.

 

Run a 295/30-19 in the back and a 245/35-19 or even a 225/40-19 in the front on this combo and you would be fine.

The 295 rear going on a 11.5 width rear rim is not optimum but it is not all that bad, actually the bit of extra width pulls the tires overall diameter down a bit making it a closer match to the 245 front.

If you like the rims that set up would work just fine.

 

Has anyone tired 255/35/19 front with the 305/30/19 rear? only .17 difference in diameter and -5.24 revolutions per mile. Or the 265/35/19 front would only be .1 difference in diameter and +2.88 revolutions per mile. Just dont know if a 255/35/19 will fit on the front of a 996TT.

The 245/35/19 and 295/30/19 that engine guy recommended is .22 difference or -6.53 revoliutions per mile for comparison.