997TT - Tire size help (19x9 front & 19x12 rear) biggest size i can run?
 

997TT - Tire size help (19x9 front & 19x12 rear)whats the biggest size i can run?

19x9 fronts with 53et
19x12 rears with 44et

To answer your question members will need to know wheel offsets

Offset makes a huge difference, but here are some possible combos, the wider the rubber, the higher the offset needed.

245/35/19 or 255/35/19 with a 325/30/19

265/35/19 with 345/30/19 if you are brave enough!

What wheels are you using, stock 997.1TT wheels?

I run those rims you mention in your post both in 19s and 20s. If running 9s in the front and having 245/35s on them.. I can tell you that when turning all the way to the right, the tire will rub on the upper inter-cooler hose (driver's side). When I have my suspension replaced, I will replace both hoses since the access will be readily available. Your alignment in the front may not have this effect, mine is set aggressively.

Offsets added

https://cimg7.ibsrv.net/gimg/www.6sp...8e1c71480c.jpg
https://cimg9.ibsrv.net/gimg/www.6sp...c123d8cc85.jpg
https://cimg2.ibsrv.net/gimg/www.6sp...89f41f8692.jpg

These are some CCW Classics that I helped a local customer out with, specs are:

19x9 +43 with 245/45/19
19x12 +39 with 325/30/19
Lowered on springs
No fender rolling or rubbing

Based on the offsets you provided for your wheels, I say you are good to go with a 245/325 setup!

It depends on the offset, but, I am running 245/35/19 and 325/30/19 without any issues. No rubbing under heavy turning or any issues. I am running PS4s and just switched from R888s 235/35/19 and 305/30/19.