That's what my thought was as well. Looks like the OEM 18"s won't fit, interestingly enough... the rear brakes are the issue.
Here's what I've been thinking:
Earlier today I went on my first test drive of a Model 3, the Performance version. And to say I was extremely impressed is the biggest understatement. I'm likely going to be ordering a P3D with the PUO wheels/brakes. My main concern is with the Summer Performance tires that come with it. In RI, we get a decent amount of snow every year, so winter tires, or at least All-Seasons will be necessary, especially when Michelin warns against driving the P3S's in temps under 40F.
While at the Tesla store (Dedham, MA), I asked the sales guy if the Tesla Factory would swap out the 20"s with the 19"s that have the Continental All-Seasons. However, he mentioned that another customer asked the same question, and they won't. And even less likely, the same customer asked if the Factory could swap out the Summer tires with similar 20" All-Seasons (specifically: Michelin Pilot Sport A/S 3+, either W or Y-rated). As expected, they won't.
I know Tesla offers the 19" wheels with winter tires on their store, they're a $3,500 USD option....a bit pricey I think. Not sure what might be available for aftermarket wheels for the P3D? Looking at tire-rack.com, they have several wheel choices starting out at around $149 USD/wheel -- Platinum Wheels Elite - Black Painted. But I'm not sure about the bolt pattern, offset, and whether they'd fit with the larger PUO brakes and rotors. I reached out to @MadHungarian on the other Forum for insight. But any other insight and suggestions would be great.
--Cintoman