Pirelli boss Paul Hembery has revealed the Italian tyre-maker made 'useful' progress this week in Bahrain while trying out a 'number of solutions' with F1 2015 in mind.A total of eight new constructions and six new compounds were tested during the two days at the Sakhir Circuit, split between Caterham on Tuesday then Mercedes and Williams on Wednesday.“Only one variable was tested at a time, so if a new compound was being tested, then the construction would be the current one (and vice versa). The teams alternated prototype runs with baseline runs on the existing tyres, for comparison purposes,” Pirelli explained.The 250 experimental tyres brought to Bahrain, distinguished by being...
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