The rims (in my case 21" Arachnids) obviously are the same, but the back wheels came with a wider tire. The Michelin Pilot Super Sport Acoustic is not a specific EV tire and my guess is that the wider rear tires are just supposed to provide a better wheel grip for RWD sports cars (clearly not an issue with a Model S 75 like ours). Since the tires can not be rotated that way, would it be possible to go all 245/35R21 or 265/35R21 once the according pair is used up and needs replacement, and is there any benefit (besides the ability of rotating tires) or downside doing so? Going all 265/35R21 would reduce the risk of making the front rims kaput but increase energy consumption. Going all 245/35R21 would reduce energy consumption but increase the risk of making the rear rims kaput. Those tires do not have a rim protection groove. As this specific setup is chosen by Tesla, why would they go this way now that the Model S is only available with AWD anyway? One would assume it makes most sense to have the same tire dimensions all around. P.S. Is it correct that the tire pressure for these 21" tires is supposed to be kept between 40 and 42 psi? They did not add a new sticker to the driver door frame.