<div class="bbWrapper"><b>Still curious...</b><br />
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It doesn't actually care about the wheel diameter, it is set up for a given wheel + tire diameter. Since a 17" wheel and 225/65R16 yields virtually the same overall dimensions as a 19" wheel with 225/55/R19, the different models of CX-5 all share the same computer. Loads of Mazdas have been built with 17" rims over the last decade, so if you hit up kijiji you should be able to find a set of wheels more interesting to look at than a set of steelies, if you care about that kind of thing. Personally, I kind of like the look of black steel wheels in the winter, but I've never had any luck keeping steel wheels from looking like total garbage after a couple winters of salt and sand.<br />
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And yeah, Nokians are expensive but they're Nokians. I've always kind of wanted to try them, but I haven't been able to justify the cost yet. I went with Blizzak DMV1s for this car, ~$650. Thankfully, no white stuff to try them out in yet.
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Maybe this is splitting hairs then. My physicist dad explained how the slightly different circumference between 17" and 19" is equivalent to just less than 1%, so it means that the odometer, speedometer, rpm, etc. are going to be slightly inaccurate. As the <br />
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I'm still putting 17" snow tires on, and really appreciate all the advice people have shared. Now, if only I can figure out how to get fuel economy to improve...</div>