13" wheels were originally introduced to limit the size of the brakes, as most of the overtaking occurred under braking and the longer the distance the more opportunity to overtake. It is also the reason that F1 brakes are not allowed to be boosted. Then somebody introduced carbon fibre brake discs, and these were just allowed to continue with no thought to what they were doing to the racing.
F1, what would you expect, certainly not continuity of thought.
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