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Along with several aerodynamics and chassis weight regulation changes, the 2017 F1 season introduces wider tires.

  • 2016 Front/Rear tire width: 245mm / 325mm
  • 2017 Front/Rear tire width: 305mm / 405mm (+25%)

Is this the widest tire dimensions that a Formula One car has ever used?

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  • VIsually the tyres used in the late 1970s appear wider than the ones for 2017 but I can't find any info re actual dimensions.
    – davidjwest
    Mar 31 '17 at 13:23
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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:

1992 formula One car with rear tyre

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  • The Tyre-Shopper article says there was a proposal to increase the rear tyres to 420mm. In reality, they were only increased to 405mm.
    – F1Krazy
    Nov 16 '20 at 21:44

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