C1 refers to the compound of the rubber that the tyre’s wearing surface is constructed from. Pirelli has developed a suite of compounds from C0 (hardest) to C5 (softest) and from these three are selected for each race weekend.

Typically three consecutive compounds are used but this is not always the case. In Melbourne 2022 Pirelli supplied a step in the range as noted in

This weekend will see the teams use an unusual mix of compounds: the C5 (soft tyres, x8 sets) for the first time this season, then a step to the C3 (medium tyre, x3 sets) and the C2 (hard tyre, x2 sets).



Andrew Burden

The author Kiwi F1 Fan