Formula One's leading teams face a race against time to understand the latest generation of Pirelli tyres this weekend when they return to action at the Spanish Grand Prix. Defending triple world champions Red Bull who lead this year's title race admitted on Thursday that they are struggling to find the best balance between outright pace and preserving their tyres in race conditions. As the F1 circus began arriving at the Circuit de Catalunya for the first European round of the 2013 season, following four 'flyaway' events in Australia, Malaysia, China and Bahrain, Red Bull boss Christian Horner said: "Our biggest problem is the tyres. "Our biggest challenge is going to be...
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