Leading teams have given a mixed response to the new Pirelli tyres that made their first appearance at last weekend's Hungarian Grand Prix.
"There is no doubt that it will be better for some than it is for others," Mercedes' Ross Brawn is quoted by Brazil's Totalrace, "but I still have no idea where we are."
After Lewis Hamilton claimed victory in Budapest it would be tempting to assume the new tyres have saved Mercedes' season though Brawn admitted: "It doesn't mean the same will happen in Spa."
But even Pirelli's head of motorsport Paul Hembery believed the new tyres have greatly helped Mercedes.
"The big difference is that they didn't have the overheating problems that we saw them have on the rear tyres in the past 18 months," he told reporters.
"If they've solved those problems, Mercedes will be very strong in the second half of the season," Hembery added.
While Mercedes seem to be happy, the same can not be said for Ferrari who claim the new tyres "do not suit" their 2013 car.
A Ferrari spokesman said: "Pirelli's choice contributed to artificially altering the hierarchy in the field, something that has not pleased the president (Luca di Montezemolo) or the men of the Scuderia.”
"This topic will be the subject of further debate in the near future," the statement concluded.
Rather than being critical, team boss Stefano Domencali admitted: "We need to understand if it has to do with the structure of the tyre, or whether it will depend on the compounds that are taken to each race.
"What is clear is that Mercedes have solved their problems with these new tyres," said the Italian.
In a bid to regain some form, Ferrari is testing a 2011 specification car at the Magny-Cours circuit in France for the next three days.
While the team can only use demonstration tyres during the three days it is understood the team is using the time to improve the correlation between data from the wind tunnel, simulator and running on track.
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