I'm no wheel/tire expert by any stretch but have my own experience with
them.I have CV900 rims, BFG A/T KO 225/70-16's. No rubbing.
I used to have the mercedes look-alikes with the 23 ET. Had both 225/75-16
and 225/65-16 and got rubbing with the 75's, none with the 65's.

Current diameter is 28.4" and is about the max you can go before
getting rub, Syncro or 2WD. Your rim/spacer set up may be what's causing
some of your problem, not just the tire size. Do you know what your final
"offset" (read: ET) is? Usually 25 is about max before you start getting
lotsa
rubbing at the outside-rear of the front wheel well with larger tires than
the 28.5" dia..
I think 37 is about the max in that direction you can go before you need
spacers
to avoid rubbing inside on steering components.
bob

On Sat, Oct 17, 2009 at 10:45 AM, Pat Patterson <SESRating@aol.com> wrote:

> I had 225 65 16 Nokians all around with GW lift springs and they worked
> great.  I wanted bigger and put on Uniroyal 225 75 16's.  They fit  fine in
> the rear but rub the front and rear of the front wheel fenders when
>  turning
> and braking.  Has anyone successfully trimmed their wheel  wells?  I don't
> mind doing it if they will clear but would be really bummed  if they
> rubbed.
> I have an 86 2wd with Audi 7.5 inch wide wheels with 7 mm  spacers.  With
> big brakes and a 2.5 Subi it will go up and down grades fine  with the
> bigger
> tires even when towing.
>
> Pat
> in SC near Charlotte NC
>