Bridgestone believes the tyre friendly Le Mans circuit could prompt the leading riders competing under Open class MotoGP rules to use their special Extra-Soft tyre for the first time in a race.

Until now Ducati riders Andrea Dovizioso, Cal Crutchlow and Andrea Iannone, plus Forward Yamaha's Aleix Espargaro have chosen to race with the harder of the rear tyres available for endurance reasons.

But with Le Mans 'the least severe circuit on the MotoGP calendar for tyres' the Extra-Soft could well be an effective race tyre - even for those with the most powerful Open engines.

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"The Ducati and Open-class riders will have access to the Extra-Soft rear slick this weekend and with Le Mans being the least severe circuit on tyres on the whole MotoGP calendar, it could prove to offer quite a performance boost in both qualifying and the race," said Hiroshi Yamada, manager of Bridgestone Motorsport Department.

The Factory class Honda and Yamaha riders will chose from the Soft (white line) and Medium (no line) rear compounds, while the Open class and Ducati riders can use either the Extra-Soft (green line) or Soft compounds.

Reigning champion Marc Marquez may have won every race from pole so far this year, but Yamada believes the Le Mans winner is hard to predict.

"The stop-and-go layout of the Le Mans circuit is quite different to the flowing nature of the Jerez circuit which hosted the last round, so it will be interesting to see which riders can use this to their advantage," he said.

"The layout of the Le Mans circuit and the variable weather always makes it difficult to predict the winner for the French Grand Prix, with few riders able to win the race from pole position in recent times."