So I have a 2005 G35C AT with the sport tuned suspension(19's). I need new tires and was thinking about the Goodyear Eagle F1 GS-D3's, 255.40.19 in the rear and 225.40.19's in the front. What do you guys think? Can I go wider?

 

Go 245/35/19 & 255/35/19

 

If you want to keep your diameters close to stock, go with 225/35-19 front and 255/40-19 rear. I don't think the GS-D3 is available in a 225/40-19.

 

If you want to keep your speedo accurate then you have to stick with the stock sidewall size. (40)