Tire Rack now has 20" wheels and tires for the Model S. The tire options include high performance all-season as well as winter/snow tires. When my MVPA turn comes I'm ordering the 21" wheels for use during warmer weather. When colder weather comes I considering 20" wheels with all season or winter tires instead of Tesla's 19" wheels. It looks like the 20" option would cost about $2500 for a set of wheels and Michelin or Bridgestone tires. Any advice? And does anyone know if Tesla will sell a 19" wheel and tire option and what it will cost? Or perhaps they'll sell just the wheels and let us mount the tires we want. Also all the Tire Rack wheels for the Tesla require centering rings. Should I be concerned about that?