Formula 2 cars to use 18-inch Pirelli tyres from 2020 Formula 2 cars will use 18-inch Pirelli tyres from the 2020 season, ahead of Formula 1’s planned switch to the same size compounds a year later. F2 will act as a test bench for Pirelli’s tyre development of the new 18-inch tyres ahead of their introduction to F1 from the 2021 season.