Q: What does the 100Y XL marking mean on this Michelin?
The 100 is the load index, roughly 1,764 lb per tire, and Y is the speed rating, good to 186 mph. XL means extra load, a reinforced casing that tolerates higher inflation and heavier vehicles. On a Tesla that matters: the battery pack adds curb weight, and the stiffer XL construction keeps the sidewall composed under hard cornering and launch.
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