 Complete the following phrase:  On lap seven, Arnoux, who had been passed for the lead by Rosberg going into Surtees, pitted for new tyres, his Ferrari wearing its rubber extremely quickly despite cool ambient temperatures Arnoux also had major tyre troubles in practice and was lucky not to damage the car after blowing a rear tyre at speed on the run to Clearways. By lap 23 and two further stops, his team had no further sets of tyres and he was forced to retire with camshaft trouble, although he had set the fastest lap of the race as consolation, though his lap of 1:17.826 in the flat bottomed Ferrari was 5.458 seconds shy of Didier Pironis lap record of 1:12.368 set at the 