It's a good thing you asked, because I actually have some experience to share on this topic.
:whistling:
First off, BFGs are excellent tires and what I was after for mine, except that after being back-ordered for almost 4 months, I ran out of time before an important [to me] car show and decided instead to go with the Cooper Cobras I currently have, since they were on the shelf at Discount Tire.
Mine are Cragar S/S 15x8 with 245/60R15 and 15x10 with 295/50R15 out back. When I initially installed them, I loved the look but discovered that the default 'off the shelf' backspacing on the S/Ss was 'only' 4 1/4" - which is bad because it causes the tires to stick out about an inch too far. I buzzed them on the wheel well openings just bouncing through a small dip in the road at 30 mph. That will not do for the long term... especially, since the roads are parts of the drainage system in San Angelo. Here are some pics:
The day I put 'em on
At the car shows:
I absolutely LOVE the look! However, I hate the thought of tearing up the sheet metal I replaced and damaging those expensive tires.
I had originally ordered the S/Ss from Summit Racing straight from their online catalog - not knowing they have an option to call and order custom back spacing, offsets, etc., from Cragar (as in, they'll custom make a set of rims for you... same price, too).
Once the new custom back spaced rims showed up, I took the rear wheels and new rims to Discount Tire and had them swapped, then popped 'em back onto the car.
Here are some better shots of the difference in 4 1/4" and 5 1/2" back spacing (respectively):
4 1/4"
5 1/2"
You can definitely see the difference, and while I haven't had a chance to drive the car yet since making the swap, I'm pretty confident I shouldn't have the rubbing issues anymore.
Hope this helps!