Valentino Rossi was disappointed with his performance in the wet during free practice as the Movistar Yamaha rider ended the day in 10th position at the San Marino MotoGP.

Rossi's time of 1m 51.738s was a yawning 2.543s behind Ducati pacesetter Andrea Dovizioso and the Italian star admitted that set-up changes implemented for FP2 had backfired.

"Today was a difficult day more or less for everybody, especially this morning. I crashed and there were a lot of crashes; there were two main reasons and first of all the asphalt of the track doesn't provide enough grip, especially in the wet, and the temperature was quite low so the grip was low," Rossi said.

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"The harder wet tyres were the main problem, especially in braking because the front tyre was too hard. This afternoon the situation was a lot better because we used the soft tyre this afternoon and the bike improved a lot.

"But I'm not happy about my performance this afternoon because we modified the setting of the bike to try to find a good balance, especially good traction in acceleration but it doesn't work enough and I'm not fast and I wasn't able to carry my speed in the corner entry so we have to work to fix the problem and hope the conditions are better tomorrow and on Sunday," he added.

"It's more difficult if tomorrow will be wet, but more or less it is the same for everybody so we have to try and improve the dry setting and try to understand the data on the wet and try to be ready for Sunday."

Rossi was unequivocal in his opinion on the large number of crashes that blighted both free practice sessions, blaming the medium compound Bridgestone front tyres.

"For me the crashes were mainly because we had the hard front. I crashed when I was braking from straight, which is very strange," he said.

"We tried something different for the wet practice but it doesn't work. We decided to continue to test in that way because we know with our standard setting we can go not so bad, but unfortunately with this setting we did not find enough and it is a problem for the wet, but in the dry everything changes."