The OEM summer tire package is 255/275 on the 20's. The all-season package is 265/275. It's been that way for the entire life of the vehicle AFAIK (Europe usually got delivered with summer tires on their X's IIRC)It looks like Tesla has their own flavor of Latitude. Here is what came on my Plaid:
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Interestingly, Tire Rack thinks my car should have 265 fronts while what is installed are 255. Anyone have anything different? Talking 20" here.