If I want to run a 275 in the back of an 06 Coupe, what size would I use in the front? Also what sidewall sizes would you reccomend to keep the car performing correctly?

 

A fairly popular setup is to run 245 on the front and 275 on the rear. As for sidewall, it depends -- what size wheels do you have?

Or, just use a tire size calculator like this one to figure it out: http://www.1010tires.com/tiresizecalculator.asp

 

I don't have the wheels yet, I wanted to figure out what tire sizes I could run and buy the wheels accordingly. I think with those widths I would get 18x8.5 for the fronts and 18x10 or 10.5 for the rears. Does that sound right?