Pirelli Formula 1 chief Mario Isola has confirmed that Mercedes, McLaren and Renault have agreed to supply a mule test car to commence testing for its 18-inch wheels later this year ahead of their introduction in 2021. F1 will make the switch to 18-inch wheels as part of the planned overhaul of the technical regulations in 2021, with Pirelli continuing as the sport's sole tyre supplier until at least the end of 2023. Speaking on Friday in Spain, Isola outlined the early details for Pirelli's testing programme ahead of the switch, which will commence later this year. "The intention is to have three sessions – September, October and November – and three teams are going to supply the...
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