Pirelli have announced that it will make changes to its tyres from the Canadian grand prix onwards.

This announcement comes after a raft of criticism has been aimed at the Italian manufacturer. Several teams have voiced their unhappiness about the excessiveness of the tyre degradation.

The Spanish grand prix saw four stop strategies implemented by the majority of the field.Pirelli motorsport director Paul Hembery told AUTOSPORT: “We never intended for there to be four-stop races, so we are going to make construction changes to the tyres.

“We will be taking some of the design of the 2013 tyres, but also some of the elements of the 2011 and 2012 products that served us so well during that period. We want to go back to having two or three stop races.”

Pirelli’s inexperience in the highly competitive world seems to have found them out. Hembery admitted that they had understimated the increase in performance the cars would make from year to year.

“They have basically been stressing everything far too much, and probably we underestimated the performance,” he said. “We cannot test with the current cars, and all we have access to is a 2010 Renault that laps four or five seconds slower than the current F1 cars do on a Sunday.”

Pirelli motorsport director, Paul Hembery.

Revisions to the structure of the tyres will be made along with possible changes to compounds. When asked about the possibility of the changes shaking up the competitive order Hembery responded with relative certainty that all should remain as is. “There have been concerns from some of the teams that the changes will favour one team or another, but we don’t think that will be the case,” he said.