Alan, not sure if one answer will work on all bodies, but, different answers for short axle vs long axle swinger and IRS cars for sure.
A lot of tire will fit under a short axle swinger and stock body, maybe as much as 225/60, I personaly don't know, but have read other articles that talk on the subject.
I do have a CMC car no flares with IRS and with 5 1/2 rims all around and 185/65's it looks good. I did have to change the rim back spacing (3/4 in) for the rears to clear.
I believe that Beck now sells special backspacing wheels just for this application. No one did 10 years ago when I modified mine. I think I could get 195/60's to clear but have never tried.
Can't speak on who makes good ones or not, my info is too old.
Good Luck - Boston Bob E
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