Pirelli: hard to draw conclusions from Jerez test

Formula One tyre suppliers Pirelli were satisfied with the performance of their new tyres at the opening pre-season test of the year in Spain, but admit that conditions at the Jerez circuit made it difficult to properly assess the revised compounds "It seems that we are very much on the right road and the changes we wanted to see are all there," said Pirelli motorsport boss Paul Hembery

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