ts6, I politely say you, sir, are correct...however, you are overlooking how the width of a wheel affects the section width of a tire when mounted.....a wider rim on a big tire tends to reduce the bulge or section width and improve the clearance (in this case to the frame)
so, a 4.5 bs may work on a 10" rim, but maybe not on an 8" rim (regarding frame clearance), if you see my point....the tire being the thing that rubs, not the rim.....
anyhow, ya can't get anything but 4"bs on 8" Telstars as far as I have been able to determine...I would really like to try some 28X10's, but it isn't gonna work on my car without some notching......
all that said, they are still the best looking wheel for a GN IMHO
let's all write Centerline and demand a 3.75" bs!