Mercedes under investigation for alleged tyre breach

By on Sunday, September 6, 2015
Mercedes AMG Petronas

Mercedes AMG Petronas

Mercedes is under investigation after an alleged breach of the minimum starting tyre pressure prior to the Italian Grand Prix.

Lewis Hamilton claimed victory at Monza but Mercedes urged him to increase his pace during the final few laps, despite holding a 22 second advantage.

He eventually came home 25 seconds clear of Sebastian Vettel, while Nico Rosberg retired with three laps to go due to an engine failure.

Full Technical Delegate's report, issued at 15:04 local time (one hour after race start):

"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 [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 110 °C 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 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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