Re: Centerline Wheel Measurements
I have 15 x 8.5 with 4.5 back spacing. I installed Hoosier 275 60 15 drag slicks. They did not interfere with the car sitting still, but were so darn close, I was afraid to drive it. Just the slightest movement, and I would have rubbed the newly painted quarter. Still had clearance on the inside, bit it was also close. I chickened out and installed 255 60 15 in the rear. Good compromise. Fits well up under the wheel wells, and no rubbing going around corners. Sold the Hoosiers for a loss (lose a little on each deal and try to make up the diff with high volume).
The same size tire in another brand might have been OK. These tire size markings are not exact on width and aspect ratio. There is some variation from one brand to another, and even one model to another within the same brand.
Having said that, I cannot imagine that Steve actually ran 275's on a 10 inch centerline with 4 and 7/8 back spacing. That would leave 1 and 1/8 inches farther out for the outside of that rim than my 8.5 wheels. I just don't see how that wouldn't rub, even sitting still, even with rolled outer lip. Maybe rolling that outer lip gained that much space. Seem like a lot of rolling. Not calling Steve a liar by any means. Maybe the 275 he ran was that much smaller than my Hoosier tire. Or maybe it had a little more back spacing, or was in fact an 8.5. Memories fade.
Bottom line is: if you want to be safe, go 255 60 15 on that 8.5 wheel.