I think I'll get 325/30/19's. That will provide about a four inch sidewall. Maybe 255's on the front with 18" wheels.You actually jarred my memory when you brought up the tire search problem. When I changed the wheels over on the red car, I was looking for a taller tire, because I wanted more sidewall between the road and the rim. 18's were out for me for that reason.
A 315 18 is a very limited size, with most of the offerings being in the 30 height ratio..(read future broken/bent rim) and are mostly either very 'spensive or rated for Xcross or road racing. Hell, for that matter the 315 size is a tough width to fit across the board.
Doesn't matter whether you go 17/18/19.
I stayed with 17's because I found a Nitto that fit my search criteria. (Not gonna apply to you either cause I wanted a really tall, weany assed 275/50/17)
So.....325's? 335's? or fall back to the plethora of "me too" 275's..............What's it gonna be?