Bridgestone announced this month that they would be withdrawing from the sport at the end of 2015.
The Japanese company, sole supplier to the top category of grand prix racing since 2009, said it had achieved its objectives of boosting technical ability and enhancing its brand globally.
Britain's Dunlop provides tyres for Moto2 and Moto3.
(Reporting by Alan Baldwin, editing by Ed Osmond)
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