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Actually, I just google searched, and what do you know, the first link is to ft86club.com...
-_-
Apparently the correct rolling circumference for a 215/45/17 tire is about 23.9 inches, so I guess there wasn't a mistake.
Funny thing is, 205/55/16s probably hit 60 in 2nd lol. Another reason to want the 16" rims, not only do they look better and tires cost less, but you can brag about a faster 0-60!
The rolling circumference isn't going to change from load. The tire may look deformed, but the outer strip of rubber that is the tread will not have changed overall length. However I'm not sure what's going on because no matter how section width is measured the aspect ratio is going off distance from rim to tread...the person who said 23.9 inches got it from an official European tire regulatory thingy website, and it seems to be in line with the observation that 2nd gear doesn't hit 60mph. Or maybe their GPS tracking was too slow, but if they use it on other cars just fine doesn't seem like it would be the case.
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