In the Tesla Related Podcasts thread, Ryan posted pictures of what appears to be a red Model 3 with 20" sport wheels. I find it hard to believe that Tesla would actually make the same wheel in two different sizes, but these pictures really do appear have wheels that are larger than the others we've seen.
First, here's a red Model 3 with 19" sport wheels:
Notice how close the rear wheels come to the side of the car.
Compare that to this photo that allegedly shows a red Model 3 with 20" sport wheels:
It looks to me like these might be like the alpha car wheels: 20" staggered.
Here's a picture of the silver alpha car with 20" staggered sport wheels, for comparison.
I'll be very excited if we're able to order these on First Production cars.
Crossing my fingers!