Am I missing something here?
I thought it was off by 5.5%.
The way I see it is that the speedometer reads only axle rotations.
So if the speedometer is reading axle rotations, and the transmission "expects" a 205/70/15, but actually gets a 225/50/16, a slightly shorter tire the speedometer should read a little high, (5.5%) as the SVX is not travelling as far as it would, if it had the expected (taller) tires on it.
