I'm due for new tires before next spring. Talked to a fellow 997 owner the other day and he had a greate experience on track with a more "square" setup, 255/35 and 285/35 in 18". I beleive he used the new Michelin PSS's. 285/35 is about same in diameter as 315/30 but that I fell is too much rear tire for a Carrera.

What do you guys think?
Also, how much neg camber can PSS tolerate on a 50/50 mix of road&track?

Thanks.

 

I run a 315/30/18 and 245/35/18 on the track and find the combo works well, having a more square setup will make your car more likely to over steer. The Porsche engineers have worked long and hard developing the right tire combination.

 

I am thinking of using either 245/35/19 or 255/30/19 on 8.5" wide rims on the front and 305/30/19 on 11.5" wide rims on the back of a 2011 Carrera S. Has anyone tried this combination? Looking to take out some of the understeer in autocrossing.