tommudd wrote:
Rich wrote:
http://www.4wheelparts.com/tire-wheel-package-guide/wheel-offset-backspacing.aspx
Since the bead thickness can be different, there will be variations in backspace vs offset between wheels and between brands.
Best thing to do is try them on.
I will get the exact BS on my Alcoas, but I believe they are 16x8 4.5", but I also see websites saying 4.75" and 5".
Beads on the tires would make no difference on the wheel
Also thickness of the wheel would also not make a difference since they are built in with what ever backspacing they want, not thickness of material
Sorry, used bead rather than flange.
Backspace is measured from the outside of the wheel's inner flange to the mounting face.
Backspace is measured from the center line of the wheel to the mounting face.
Wheel width is measured from bead to bead.
...and this is all compounded by different manufacturers use different standards and different rounding to report their numbers and ET vs BS.
The absolute measurement would be BS, independent on material/etc, but this is only good for the inside of the wheel hitting hard parts. Outside of the wheel contacting hard parts, tire location in relation to wheel mounting surface, and how far that wheel is going to hang outside fenders is all relative.