Quote:

they are informative, but not accurate.



Actually, they're informative and accurate. They're not miscalculating the sizes that you input. It's up to the user to decide if they want to use the sizes given by the calculator.

Quote:

I had 19s



That's the problem right there.

Really, we shouldn't be comparing 17's to 18's to 19's because there's going to have to be a sacrifice somewhere, be it in the small size of the sidewall or the possibility of rubbing with a tire too big.

With 17's and having tried quite a few different sizes, I've found my currect size to suit me fine. If I go 18's, I'll probably shoot for 225/40. I'd like to go 235/40 again, but with an 18" tire I may rub.

1999 SVT Contour 2003 Honda Pilot 2005 Toyota Tundra