That will be an interesting option Jeff, be careful with getting too much grip on the rear as I have just learned an expensive lesson with mine. I had 9x15 on the back of my striker with 245/40/15 cr500s on.
First thing to break where the drive shafts, they snapped twice, diff seems to be OK but the next week link was the gearbox. Just got it back from the rebuild and it is virtually a new box as most bits where broken. Spoke to the guys at procomp who said I should not got over 205s for the striker?
I have opted for 195s all round so will have to see what happens

I know people do put larger tires on and wonder if anyone else had had any problems with them?