Motor racing: Drivers demand answers after Spa punctures
SPA-FRANCORCHAMPS, Belgium (REUTERS) - Formula One drivers sought reassurance from tyre supplier Pirelli on Friday after world champion Sebastian Vettel and Ferrari's Fernando Alonso suffered punctures in second practice at the Belgian Grand Prix.
Red Bull's Vettel was fastest in the dry session but the sight of him nursing his stricken car back to the pits at slow speed with strips of right rear tyre buckling and flailing was more of a talking point.
Pirelli had to strengthen their tyres after a spate of blowouts at the British Grand Prix in June triggered safety fears and threw the sport into crisis.
Alonso had a rear right puncture too, also at around turn 14, at the end of the session and reserved judgement on the causes.