Pirelli motorsports boss Paul Hembery admitted that the Korean Grand Prix didn't turn out the way that the tyre manufacturer had been expecting.

For one thing, the tropical storm that had been forecast for the region over the weekend fortunately veered away at the last minute, leaving the Korean International Circuit dry throughout the three days of on-track activity.

However it did make for a sudden cooling-off of the track temperature which is why Pirelli's own predictions for the optimal race strategy were "not quite right when it came to the timing of the stops," as they company admitted afterwards.

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"With the medium compound proving to be the ideal race tyre, most drivers aimed to get onto it as soon as possible, with teams reacting from the start of the race to the strategies that had been put in place by their immediate rivals," explained Hembery, Pirelli's director of motorsports. "We had a tyre choice that may have been aggressive, with the supersoft being a perfect qualifying tyre and the medium optimal for the race, but this was in accordance with the requests of many of the teams.

"The two safety car periods had an important effect on the race strategy, which meant that all the finishers apart from one completed the race with just two stops. Without safety cars, we probably would have seen more people stopping three times, but it was always going to be within the two to three stop window, which has been our target since we came into F1."

See more from Paul in his video report filed from Yeongam:

"Regarding Sergio Perez's front-right tyre issue we have been able to determine very quickly that it was the result of a flat spot caused by a lock-up under heavy braking," Hembery added. "We're obviously on exactly the same construction as we raced here last year, so there's no underlying problem, while flat spots or punctures have just always been an integral part of racing."