Pirelli has justified its decision to introduce a 'super hard' compound into its range of 2018 tyres as insurance against next year's car development.
The Italian manufacturer, which has been Formula 1's exclusive supplier since 2011, introduced the superhard and hypersoft tyres at each end of its compound spectrum.
But F1 teams doubt the former will ever been seen in 2018.
"Quite simply, it's our insurance," Pirelli boss Mario Isola told Speed Week.
"Basically, we assume we will never use the super hard tyre. But it's still difficult for us to assess how quickly these new cars will be developed, and whether some corners could become critical."
"The hard tyre is enough on the circuits that put the tyres through a lot, but according to the regulations we may add another compound during the season. It's better to be safe than sorry," Isola added.
Gallery: The beautiful wives and girlfriends of F1 drivers
Keep up to date with all the F1 news via Facebook and Twitter
Alpine’s remarkable double podium at the São Paulo Grand Prix with Esteban Ocon and Pierre…
Alexander Albon, Williams (Did Not Start): 5.5/10 Alex Albon is definitely going through something of…
Jos Verstappen wasted no time after his son spectacular win at the São Paulo Grand…
Charles Leclerc's weekend in Sao Paulo was unfortunately a stark contrast to Ferrari's recent triumphs…
Twelve years ago on this day, Kimi Raikkonen took a popular win at the 2012…
The Mercedes team was hit with a fine by the FIA after Sunday’s Sao Paulo…