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Originally Posted by Lil bastard
Well except that the sidewall height isn't a set height, it is a percentage of tire width.
A 50 series tire has a sidewall which is 50% of the width of the tire. And tire width brings you back to the wheels because, as has already been mentioned, the smaller wheels do not generally come as wide.
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I don't disagree with you and my comment was not meant to advocate smaller wheel sizes necessarily. Stock 17 OEM tire size is 205/50/17 front and 255/40/17 rear from what I understand. So if you stick with a 50 or a 40 for handling then you must increase diameter with a larger wheel, or you must choose a lower profile tire which will have different characteristics. Otherwise you are opening a can of worms by running larger or smaller diameter tires than stock. Trust me, I know all about the ramifications of tire size changes from my Land Rovers. We have to re-gear two diffs to maintain drivability with 35" tires.
For my purposes though, the stock boxster profile is fine. I am confident that I will get the best compromise of comfort and handling with these sized tires. The fallicy is that lower profile is better, that is what I was addressing.