Pirelli's 2014 F1 tyres are "more consistent and durable" than last year, according to Paul Hembery.

After running in cool conditions during the first test at Jerez, the second test in Bahrain last week allowed the teams to focus on the new tyres in more representative conditions. With a total of 2322 laps being completed throughout the four days, Pirelli was able to gather plenty more data and Hembery said one clear change was that there was less debris from the tyres being discarded on to the track.

"The teams were able to learn more about tyres over the four days in Bahrain than they could in Jerez two weeks ago, thanks to increased running time and optimal weather conditions," Hembery said. "Although the teams are still at a comparatively early point on the development curve with their new cars, testing data so far indicates that the 2014 tyres are more consistent and durable than their predecessors. As a result, we are also seeing fewer 'marbles' on the circuit: one of our objectives at the start of this season.

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"However, teams are likely to improve their performance and understanding of the car-tyre package still further in the test to come, which means that the lap time differences we have been seeing between the compounds are likely to come down: especially when the teams discover more downforce as the season goes on.

"We've collected plenty of useful data from this test, but of course we are still ready and able to change the specification of the tyres for the start of the season if this is shown to be necessary."