A Tesla Youtuber snagged a Chinese only market 'Power Sports' 19" aerodynamic wheels. The integrated aero cap flush to the rim was the lightest design approach and satisfies the optimization goals. Tesla VP of engineering said that Tesla Model 3’s aero caps can increase efficiency by ~10% better than the bigger non-aero 19" wheels. It is also only 0.8 heavier than the standard 18" wheels @ 49 lbs.
The next Model S and Model X will have the 19" aero wheel option.
https://i0.wp.com/electrek.co/wp-con...trip=all&ssl=1
https://electrek.co/2019/09/23/tesla...arousel-104130
https://www.youtube.com/watch?time_c...&v=kC4Z8bdF1b0