It is actually right there, when you configure the vehicle. You just have to hit the "i" circle (information) when selecting the wheel option to see the description.
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Yeah, clicking one more time is a true hardship for many in this day and age, but really, when putting an order for such a high price car, shouldn't one pay attention to every single thing? Also, something like this can be quickly observed during the test drive. Again, I would not buy such a high price vehicle without a test drive (or three).
Finally, there is a detailed spec sheet in the site:
Page two at the bottom.