The 20" tires on the performance model 3 are most likely a Michelin Pilot Sport 4S (PS4S) and they should not be used below 20F. As reported in another venue: "However, Michelin notes that its summer tires—specifically the PS4S—are not recommended for use in the cold. When Michelin's summer compound tires are exposed to cold air below 40 degrees, the tire compound stiffens and loses pliability, and the grip level can degrade. As temperatures dip below 20 degrees, the tire's surface area may begin to crack due to improper exposure and use—and those cracks would void the warranty."