Just ordered my P85D with all possible options except I went with 19 inch Wheels. Tesla says I'll get my car before the end of the month. That's quick! Now I am in a 2012 BMW 550i-M Sport with 19 inch staggered wheels. Before the BMW, I was in a Jaguar XF R with 20 inch staggered wheels. I live in Silicon Valley. Some highways around here has potholes, ridges, and rough un-even surfaces. Also it seems there is road construction going on all around the areas I live and work. On my Jaguar, I went through 4 set of tires, mostly NOT due to wear but due to damage. I got tired of replacing tires and getting the rims fixed. Over the 3 years I had to get my rims fixed twice due to bends. In the BMW with 19 inch wheels was a much better experience. BMW came with run flat tires, after about 10K miles, I took them off (stored them for lease return) and switched to Continental ExtremeContact DW. That was the best decision I made, this tire holds very well for my style of driving on corners and ramps, and it is very quiet.
I did several test drives on Model S with different drive and performance combinations. Kim at Sunnyvale Tesla Store was very patient with me over the months before I made the decision to buy. I drove P85D with 19 inch and 21 inch wheels. The 21 inch Michelins have rigid side walls, so it gives you a harder ride and the tires are noisy. Also the ONLY option now for the 21 inch rear tires is the Michelin ($585 at TireRack), I could not find another manufacturer offering that tire size. The bad thing about the 19 inch rims is that it comes with all-season tires. I am thinking that I’ll drive on the all-season tires for some time, tek them off store it, and switch to Continental EC DW.
In my research I found some lightweight aftermarket 20 inch staggered setup options out there. Something I should look into.