Ok you guys are picking some odd sizes there.
if a tire is a 285/70/17
285 is the width in cm's
70 is the percentage of the width(285) in height
17 is the wheel diameter.
Yall don't realize it but those tires are huge. I have 265/60/18's, and they are a lil bigger than I wanted. Having 17" wheels is different, but not that much.
Paul