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Along with several aerodynamics and chassis weight regulation changes, the 2017 F1 season introduces wider tires.
Is this the widest tire dimensions that a Formula One car has ever used?
After searching a bit, there is not much detail or a definite answer, but this Autosport article says the 1992 tyre width was 420mm and the biggest until now.
But this other link of Tyre-Shopper says the same width was used in 2017.
This is the tyre used in 1992:
