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Formula E Tweaks Minimum Tire Pressure Rule

The FIA has made a change to the pressure range of the Michelin tires for today’s Monaco EPrix….

Photo: Formula E

The FIA has introduced a modified regulation to the minimum tire pressure rule for today’s ABB FIA Formula E Championship Monaco E-Prix.

The change will now see just one single pressure implemented for teams rather than a cold and warm pressure reading after sessions.

The rule, which is described in Article 25.11 of the sporting regulations, determines the tire temperature working range for the ‘Pilot Sport Race’ rubber that Michelin provides to all teams.

The minimum pressure will now be 1.4bar on both the front and rear tires for the Monaco race, where previously the pressure was 1.3bar.

The specific rule states: “All competitors must comply with the working ranges of the tires (minimum and maximum camber, minimum cold and hot pressure) as communicated by the tire manufacturer before the end of initial scrutineering.”

Now, teams will only have one temperature to abide by, but it’s understood that the rule in general is wholly unpopular with competitors.

Multiple technical directors and engineers have told e-racing365 there is no reference temperature set or a specific time given for when pressure readings are conducted by Michelin’s engineers.

Michelin confirmed to e-racing365 that the pressure control “can be different for the other races” in Season Five. By regulation, the company can control and measure tire temperatures.

A form of active RFID chips could be used by Michelin in Formula E from next season onwards. A similar system has been employed in the FIA World Endurance Championship for several seasons.

Mahindra lost its front row lockout grid positions at the last round in Paris due to its cars’ tires registering outside the minimum pressure immediately after Super Pole.

However, this was later discovered to have been related to an issue with calibration equipment used by the team.

Sam Smith is e-racing365's Formula E Editor. A 20-year veteran in motorsports media, including press officer roles in both the FIA Sportscar Championship and at Lola Group, Smith is a well-known face in the Formula E paddock, where he served as series editor for from 2014-17. Contact Sam

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