Pirelli put plans to introduce new race tires at next month 's Canadian Grand Prix on hold . Each of the 11 teams will instead try out development tires in the first practice session . Pirelli wants to change tires to stop delaminations . The FIA has said it is not happy with this and that they want a solution by Friday, but there are no guarantees about when or if any changes can be made.
Pirelli put plans to introduce new race tires at next month 's Canadian Grand Prix on hold . Each of the 11 teams will instead try out development tires in the first practice session . Pirelli wants to change tires to stop delaminations . Mercedes face an FIA investigation over involvement in tire test .