I don't know much about wheels, I'd like to know more about them in general and on the Model S. OK. So the car comes with wheels, 19" by default. 1)If I get more than 19, such as 21, what affect does this actually have? will it get more control? Will it give me more range(Gas too)? will it reduce range? Is it safer? Is it simply for aesthetics? to look nice? 2) can one opt to get 20" after purchase? I see that Tesla only offers 19 or 21. Is getting 20" even allowed? would it be the best of both worlds? Thanks, if any more questions come to mind I'll be sure to post them.