Stewards take no action against Mercedes over low tire pressures in Italian Grand Prix

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The FIA stewards have taken no action against Mercedes over a suspected technical infringement during today’s Italian Grand Prix at Monza.

In the aftermath of Lewis Hamilton’s victory, it was revealed that the FIA technical delegate had referred both of Mercedes’ cars to the stewards after they were found to be running under the minimum starting tire pressure.

Hamilton’s tire was found to be 0.3 PSI under the minimum starting pressure, whilst Rosberg – who ultimately retired from the race at Monza due to an engine failure – was running 1.1 PSI too low.

However, the stewards have determined that the tires were running at the minimum start pressure recommended by Pirelli when they were attached to the car.

“Having heard from the Technical Delegate, the Team Representatives and the Pirelli Team Tire engineer, the Stewards have determined that the pressure in the tires concerned were at the minimum start pressure recommended by Pirelli when they were fitted to the car,” a statement from the stewards reads.

“In making this determination regarding the pressures, the Stewards noted that the tire warming blankets had been disconnected from their power source, as is normal procedure, and the tires were significantly below the maximum permitted tire 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 Tire Manufacturer, for the safe operation of the tires.

“Therefore the Stewards decide to take no further action.

“Nevertheless, the Stewards recommend that the Tire Manufacturer and the FIA hold further meetings to provide clear guidance to the teams on measurement protocols.”

As a result, Hamilton’s victory at Monza stands, meaning that he opens up a 53-point lead in the drivers’ championship ahead of the Singapore Grand Prix in two weeks’ time.