Pirelli motorsport boss Paul Hembery expects the 2015 F1 cars to be over a second quicker than those which ended this season.

The tyre supplier tested some of its 2015 tyres during the Abu Dhabi test this week in order to get data ahead of the start of pre-season testing at Jerez on February 1. However, Hembery admitted it remains tough for Pirelli to reach its objective of opening up varied race strategies because it expects to see such a big step in performance once again over the winter.

"Our objectives with the 2015 tyres remain the same as they have always been: to provide between two and three pit stops per race," Hembery said. "One of the biggest factors of course will be the way that the cars improve: we're expecting to see cars that are a second per lap or more faster than the 2014 cars next year, and this obviously will impact on tyre behaviour."

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Explaining the feedback Pirelli received in Abu Dhabi, Hembery highlighted the changes it has made to the tyres and was happy with their performance.

"We've been very pleased to hear the initial impressions from the drivers of our new tyres, which suggest that the improvements we have aimed for are already taking effect. We've made a few small alterations: in particular to the belt area of the rear tyre that sits in the footprint. This new construction optimises the temperature distribution through the tyre in order to distribute heat more evenly, which should lead to more consistent performance and better traction. We've also got a new supersoft compound on the rear, which is designed to improve mechanical resistance."