Pirelli are growing increasingly more frustrated as more criticism is levelled at the Italian tyre supplier ahead of Thursday's International Tribunal hearing in Paris.
The latest criticism comes after Pirelli revealed the tyre allocations for the next few races with the decision to take the hard and medium compound to the Hungarian Grand Prix in August proving the most controversial.
"It's unusual to take the same tyres to Hungary as to Bahrain and Silverstone," Lotus engineer Alan Permane told the BBC.
"It absolutely doesn't make sense -- they're too hard for that track."
Force India driver Adrian Sutil is also unsure why Pirelli are making such conservative tyre choices.
"I have had no major problems with the tyres," Sutil told the German broadcaster ZDF.
"A lot of people are complaining, but I'm not, really, because it's a challenge that's the same for everyone. We all have the same tyres."
The decision to take the two hardest compounds to Hungary is certainly a strange one with the softest compounds normally taken to what is the slowest permanent track on the calendar.
Despite that Director of Motorsport Paul Hembery defended the decision telling Sky Sports Pirelli are "trying to do our job in quite difficult circumstances.”
Hembery's frustrations over a lack of cooperation have become much more vocal in recent weeks and could be set to boil over when Pirelli goes to the International Tribunal along with Mercedes over the 'testgate' scandal that has gripped the sport.
"We will see how things progress over the next period of time to see how the mood changes," said Hembery.
"An easy reaction would be to say 'this is madness, get out,' but we are a company that likes to provide solutions."
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