So the stock 04 set up is

225/45/18
245/45/18

So, when going up to 19s, I see the general rec for the fronts is

245/35/19

Now, for the back I've seen two set ups

275/35/19 and 275/30/19

What's better? I went to that tire size calculator and for the latter, the speedometer will be out about 4.4% whereas with the former it will only be out by 0.4%.

So, have I just answered my own question? 275/35/19?

 

Umm, ok, I guess the right answer is

305/25/21

Thanks LOL

 

Yeah, definitely go with 35 series tires for the 19s (depends on the width of the wheel as well).