Formula One world champion Sebastian Vettel declared himself impressed after road testing the new Pirelli tires that are to be used for the 2011 season.
The Red Bull driver was back at the Abu Dhabi circuit where he clinched his first ever drivers' championship crown last weekend, after edging out teammate Mark Webber and Ferrari's Fernando Alonso.
The Yas Marina track played host to all 12 Formula One teams as they began a two-day tire test on the Pirelli rubbers, set to replace Bridgestone from next year. A total of eight sets of tires are available to teams during testing.
Ferrari's Felipe Massa, who finished a disappointing sixth in the drivers' standings, was quickest in the unofficial timings on Friday, with Vettel in second.
CNN
