So my new 19in. wheels for a 996tt just came in, but I'm questioning the tires on them. As many of you will state, they are not suitable:

-front:235/35/19
-rear:305/30/19

The front has a diameter of 25.5" while the rear is 26.3", a difference of .8"!!! I understand that the stock fronts with Michelin PS2 is 25" and for the rear is 25.1", so the problem is clear already. The Tire Rack calculator is telling me less than 3% mismatch, but a calculator isn't incorporating a very sensitive, viscous coupling differential of a 996tt. Any recommendations on new sizes?