This evening, it was announced that Lewis Hamilton and the Mercedes team have kept their Italian Grand Prix victory after the Formula 1 stewards ruled no action was necessary over a potential tyre pressure infringement.
The left-rear tyres of Hamilton’s and team-mate Nico Rosberg’s cars were both found to be below the pressure stipulated by F1 supplier Pirelli for the Monza weekend – by 0.3psi in race winner Hamilton’s case and 1.1psi on Rosberg’s car.
But the stewards determined that the tyres were initially inflated correctly, and had reduced in pressure by the time the measurement was taken because they had cooled down due to their warming blankets being unplugged.
The FIA issued the following statement regarding the investigation into Hamilton as follows:-
‘Having heard from the technical delegate, the team representatives and the Pirelli team tyre engineer, the stewards have determined that the pressures in the tyres concerned were at the minimum start pressure recommended by Pirelli when they were fitted to the car.
‘In making this determination regarding pressures, the stewards noted that the tyre warming blankets had been disconnected from their power source as a normal procedure and the tyres were significantly below the maximum permitted tyre blanket temperature at the time of the FIA’s measurement on the grid and at significantly different temperatures from other cars measured on the grid.
‘Further the stewards are satisfied that the team followed the currently specified procedure, supervised by the tyre manufacturer, for the safe operation of the tyres. Therefore the stewards decide to take no further action.’