Originally Posted by Nordstat
I guess I just don't understand the spacings. If the original offset was 29 and I go to 18, that's 11 mm (~.43"). The wheel width increased 0.5" from 8.5 to 9. That doesn't mean a net change of 0.07" (1.7 mm)?
The offset is the distance between the wheel mounting face and wheel centerline. Switching from an 8.5et29 to a 9et18 does indeed move the F rim of the new wheel out 0.70" (not 0.07") relative to the old wheel.