Pirelli has conceded to issues with its prototype tire that could result in it not being introduced into Formula 1 as planned later this year.The Italian manufacturer opted to develop a new soft compound rubber to make it more resistant to impacts with external objects, such as curbs.In practice at...

Formula 1 teams will test a prototype tire for Pirelli during Friday practice for the Belgian Grand Prix.F1's tire supplier has developed a new construction it says is more resistant to impacts from curbs.Related StoriesFerrari's Sebastian Vettel suffered rear tire failures at Spa in 2015 and during this year's Austrian...