So I measured my 16" sport wheels today with a tape measure, and they measured 17"........um I'm confused, I thought that 16" was supposed to be 16"? So if I got 20" wheels, would they actually be 21"? Can anyone explain?

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did you measure the outside bead on the rim?

I would say you would need to measure where the tire actually sits(the bead) on the inside of the rim.

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exactly! which should be 1/2" or 5/8" lip, which would make the rim 16"

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ya, like the others said you need to measure the bead where the tire sits.

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