Lewis Hamilton's dominant victory in the Italian Grand Prix is in doubt due to a stewards' investigation at Monza.
Despite Hamilton holding a comfortable lead, Mercedes told him to push hard in the closing laps to try and extend his advantage. While Hamilton was confused as to the reason for the request, he duly delivered to win by 25 seconds.
However, as the chequered flag fell a stewards' investigation was announced as both Hamilton and team-mate Nico Rosberg's tyre pressures were found to be below the minimum pressure on the grid.
The full report from FIA technical delegate Jo Bauer reads:
"On the grid and after the 5-Minutes signal the tyre starting pressure and tread surface temperature of the left hand side rear tyre were checked on car numbers 44 (Hamilton), 06 (Rosberg), 05 (Sebastian Vettel) and 07 (Kimi Raikkonen) and were compared with the specifications of the official Formula One tyre supplier. The specification for the minimum starting pressure is 19.5 PSI for the dry weather rear tyres and the maximum tyre blanket temperature is 110C for all dry weather tyres.
"The tread surface temperature of the left hand side rear tyre of car numbers 44, 06, 05 and 07 was within the specification of the official Formula One tyre supplier.
"The measured minimum tyre starting pressure of the left hand side rear tyre of car numbers 05 and 07 was above the specified minimum tyre starting pressure.
"The measured minimum tyre starting pressure of the left hand side rear tyre of car number 44 was 0.3 PSI below the specified minimum tyre starting pressure and the measured minimum tyre starting pressure of the left hand side rear tyre of car number 06 was 1.1 PSI below the specified minimum tyre starting pressure.
"The tyre pressures were checked with the calibrated tyre pressure gauge of the official Formula One tyre supplier on all four cars.
"I am referring this matter to the stewards for their consideration."
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