There have been a few other mentions of wheel spacers but since I installed them today I thought I would start a thread devoted to the topic. I used 18mm spacers front and rear, which widens the stance 36mm or about 1.5 inches. It also makes the outer edge of the tires flush with the fenders, which provides a more aggressive appearance. I determined the size by measuring the distance between the fender edges and the outer edge of the 45/40R-20 Pirelli Cinturato P7 tires, which turned out to be about 20mm. As I'm installing Continental EXTREMECONTACT DWS 06 XL 245/40ZR-20 tires on the wheels next week, and their section width is about 2mm less than the Pirellis, I chose a spacer width of 18mm to account for that difference. The spacers, which were machined to order by Motorsport Tech Inc. are hub and wheel centric, an essential quality of spacers over wider than about 5-9mm. BTW, I highly recommend Motorsport Tech. Their customer service is fantastic and Lenny, the owner, personally handled my order and communicated with my about various matters. With an 18mm spacer the stock Tesla studs will be too short to safely attach the wheel. So the Motorsports spacers are a one-piece item with holes and nuts to attach them to the stock studs and their own studs for mounting the wheel. Here are a few photos of the spacers on and off the car. The stock studs are one of the darker color in the photo below. As I many go to a staggered set up, I also have a set of 275/35ZR-20 CONTINENTAL EXTREMECONTACT DWS 06 XL for the rear. So I also ordered a set of 5 mm spacers, which will make this much wider tire flush with the fender edges. These spacers are hub centric and this is what they look like. The hub lip is on the reverse side so it doesn't show in the photo. BTW, unless your wheels have the pockets on the hub side shown in the photo below spacers of the kind I installed won't work, as the pockets are essential to make room for the stock studs when the wheel is mounted. I was able to shoot some "before" photos of the car and wheels but didn't have time to shoot any "after" photos. Will do that tonight and post them.