18-inch tyre testing between Pirelli and Renault to take place in September

Pirelli boss Mario Isola has announced the tyre manufacturer's plans for the new 18-inch tyres will be brought to Formula 1 in 2021.

Formula 1 will introduce new and bigger tyres in 2021, with the current specification being 13-inch in diameter, with a further five inches to be added to the wheels.

Renault will now take part in a test in France at the Paul Ricard Circuit in September. McLaren will also take part in a test a couple of months later and Mercedes in December.

"(All the tests are planned as) dry sessions for the moment," Isola said to FormulaSpy. "We will start soon to make a plan for 2020, where we have 25 days of testing to distribute to the teams that are willing to test 18-inch tyres."

Pirelli will introduce the same size tyres in Formula 2 the season before its introduction to F1, in preparation for the change in 2021.

"We did just one shakedown in Mugello, but it was really a shakedown to understand the driveability of the car with an 18-inch tyre," the Pirelli boss added. "Don't forget that the F2 car is without power-steering, so the first target was to understand if they need to adapt the car, and if how to adapt the car with the new tyres.