Originally Posted by Cylon_xD
Tire sizes are kinda a moot point, because you buy the tire to the same overall diameter as the stock tires, no matter if you are buying 15" or 19" rims - unless you want to go to the expense of recalibrating the speedo after putting a larger or smaller diameter tires on your car. The larger the rim size, the lower the profile (height) of the tire you put on it, so that the the outside diameter (or circumference) of the tire stays as close to stock as possible.
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Just to take this point and add a little note to it for your reference.
if you try to run 15's like Jonas (on scionlife) and myself (and probably a few others), 225/50/15 is one of the only decent sizes that even comes close to the proper overall diameter for our cars, and its still 5-6% smaller leaving you at about 5mph's too fast on your speedo. IMO its just something you get used to, used a gps to give me an idea of how much my speedo differs and you adapt it, no reason to recal anything except for mileage accuracies.
I love my 15's but I think Id recommend 16+