For me it is the sourcing and the cost of the 21" but mostly they will be no good in the snow. I will run the 21" but need to know that 20" non-staggered 255/40-20 will work for a set of winter rims/tires. As soon a I hit a pot hole and destroy one 21" I will be back here whiningI know you guys up North have issues with the lower profile tires, but in my personal opinion the wheels are a major part of the look. Go look at a Model S with 19's vs one with 21's. The one with the 21's looks way better. Narrower sidewalls and the bigger wheels fill the gap better. I would go with the 21's or 20's. The red 1,000,000 looks really good with the black wheels.