I personally would shy away from the idea... I've got a set of 205/65-15 on turbo wheels for my summer tires, first on my 164, and now on my 145... First I had to roll the lip on both rear fenders... and they'll still scrape if I've got a heavy load. And, if driving over rocks/stumps/curbs and the front wheels are at half lock or more, they hit the inside front on the front fenders pulling the fenders down and out, and taking big chunks out of the outer edge of the treads.

That said though, if you mostly do city/highway driving (I go off road a bit), and you don't carry lots o' heavy stuff, and you don't mind rolling them fender lips, you can get away with it. My next set of tires is gonna be 195/65s though... Hell, for that matter, you can have my tires if you want 'em... only got about 10k on 'em.

-Matt