Duster tire size

70 Buster 340 said
my experience on 70 Duster.
at 28" tall there is no issue clearing front of wheelwell ... but...275's have about 11.2 inch section width on 8" rim and that's too close to the spring with 4 or more inches of backspace.
That's With original spring location and axle width.

As mentioned earlier, the BBP axles increase the brake offset. There would've been no way to get my wheel/tire combo on the car without that. There was a while after I'd ordered the tires that I was shopping for wheel spacers but it turned out I didn't need them.