Another (will this fit?) Wheel and Tire ?

wes beem said
Wanting to run the wheels linked below, and i want the widest possible tire i can fit in the back on my 71 Duster with disc brakes up front, drums in back. Up front I don't care how narrow i have to go....I keep seeing people say you need 4.5" of backspacing for mopar a bodies but every single wheel i like is 3.75" or less. Will these work, and if so what size tires can i run?

American Racing 235865B: AR23B Series Wheel Size: 15" x 8" - JEGS High Performance

American Racing 235765B: AR23B Series Wheel Size: 15" x 7" - JEGS High Performance

In the front, with BBP brakes and assuming you probably have a 73+ disk set up your 15x7's with a 3 3/4" backspace will put the outer lip of the rim a 1/2" further out to the fender than the 18x9's I run on the front of my car. Even with a 205 wide tire they'd stick out further than the 275/35/18's I run. So, those 15x7's are a bad choice. Most of the BBP disk conversions widen the track width at least as much as the stock 73+ BBP disks, so, I'm pretty confident in that recommendation. With a 7" wide rim up front with BBP disks you really want 4.25" of backspace. 4" can be done if you stick to 205's, but less than that is just gonna put the wheel too far out unless your ride height is going to be super high.

In the back it will depend entirely on what axle you have and how wide it is.

33IMP said
On the back, we don't know if it's a 7 1/4 (highly unlikely with a bbp) or an 8 1/4 swap, or a a-body 8 3/4 with a pattern change on stock drums and axles, or an a- body with b-body brakes and axles, or a b-body axle swap, or which b-body swap.
Long way of saying, your gonna have to do your own actual measurements
For what it's worth, if the wheels you want are one piece and don't offer different b.s. , I would go smaller by an inch on both ends, 15x6 and 15x7.
First thing I would do is measure the actual drum to drum width of your rear (the cars, not yours), and go from there.

Actually a ton of A-body 7-1/4's came with the BBP. Any 73+ A-body with front disks and something other than a 340/360 could have gotten them, not all the 318 cars got 8 1/4's. My '74 Duster came with a /6, BBP disks and a BBP 7 1/4 rear. And since '74 was the highest production year for Dusters, well, there are a lot of BBP 7 1/4's out there.

Going smaller in the back on a Duster is kinda silly because of how much tire you can get back there. 275's fit most cars just fine without any modifications, there are literally DOZENS of Dusters/Demons/Dart Sports on this board with 275's in the back and no mods. If you don't believe me, well, here's a few threads showing well over a dozen Dusters doing exactly that...
Demon Rear Wheels
275/60/15 tires on stock Duster

Now if you don't want to run 275's in the back that's fine, you do need to get the backspace right in order to do that. And of course to get the backspace right you'll need to know which rear axle you have, because the BBP 7 1/4's and 8 1/4's are a completely different width than an A-body 8 3/4 with BBP axles. And even that assumes you don't have a B-body 8 3/4, which is not an uncommon swap on a Duster.