Conditions at the start of the twenty-three lap Aragon Grand Prix were completely dry, with all riders initially selecting slick tires. Although conditions were considerably cooler than yesterday – the peak track temperature was only 23°C - only seven of the twenty-three riders selected the soft compound front slick, with the remaining sixteen riders choosing the medium compound front. For the rear tire, both Repsol Honda riders and LCR Honda’s Stefan Bradl opted for the hard compound rear slick, with the remaining Factory Ducati, Honda and Yamaha riders selecting the medium compound rear. For the Open-class riders, half the riders opted for the medium compound rear slick, the other half for the soft compound rear at the start of the race. Both the hard and soft compound wet tires were used by riders in the final stages of the race after they changed bikes, with the hard compound wet tire being used by two-thirds of the field, including the three riders on the podium.