Pirelli has renewed its threat to leave F1 at the end of this season amid slow negotiations for a new deal and the on-going 'testgate' saga.

The Italian tyre supplier is having a difficult year as their 2013 specification tyres are currently being criticised from many angles and now the eruption over the secret test that took place with Mercedes in May has only added to the speculation that Pirelli will pull out after this year.

Pirelli is also said to be very unhappy on the testing restrictions currently in place and Mercedes team boss Ross Brawn struck an uncertain tone when talking about whether Pirelli will be in the sport next season.

"Discussions about testing for next year will certainly be beneficial for whoever the tyre supplier is in the future," he said.

Italian newspaper La Repubblica said Paul Hembery reiterated the threat to leave F1 "if we are unable to do some tests with the new tyres before the start of the season.

"We cannot continue to work in the dark. By September 1st we need to provide the specifications for next year, but we don't even know what the cars are going to be like.

"We believe that the (2014) tyre should be wider, but we don't know by how much.

"This year, because of the lack of tests ... we ended up with these cases of delamination, and then because we couldn't go onto a track we had to remedy it in the laboratory."

Lotus have also put a spanner in the Pirelli works by not agreeing to the introduction of a new Kevlar belt that replaced the old steel belt and was tested in practice on Friday in Montreal.

"If that's right, we will use the same tyres for the rest of the season. There may be some more four-stop races, but what can we do?" said Hembery.

Some are suggesting Pirelli may have to resort to glue to add extra adhesion between the tyre tread and the carcass if the teams do not agree to the introduction of the new tyres.

Either way Hembery struck a defiant tone when talking about the manufacturers future in the sport.

"We don't want to have another season like this one," he told La Repubblica. "Our (F1) contract is expiring. Will Formula 1 be without tyres? I don't know, but that's not our business.

"Who knows, maybe they'll find another supplier willing to work in the dark."

But Hembery does believe the upcoming tribunal hearing on June 20 does give Pirelli a chance to outline its conditions for a new contract from 2014.

"We will wait for the tribunal, but then there will be several elements that need to be discussed. We are talking about issues that have a clear impact on our business.

"This is not just a matter of waiting for the truth to come out," he is quoted by Canada's La Presse, "but also a question of doing things differently in the future."

With the future currently uncertain respected journalist Michael Schmidt took the opportunity to add a conspiracy theory into the frame.

"Does Jean Todt have a secret agenda, and wants Pirelli to get so angry that they leave voluntarily, opening the door to Michelin?" he said.

Michelin are the only tyre supplier currently said to be pondering a return if Pirelli does pull out at the end of the year.


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