A very bumpy circuit was one of the main talking points on day one of the Austin MotoGP round, with Scott Redding revealing his feet were shaken off the 'pegs.

"This morning I was first out and my feet came off the 'pegs two times," he said. "Once on the straight and once going into turn three because the bumps were just shaking me off. The bumps are really bad here. We haven't got another track this bad.

"We had bumps here before, but every year it's getting worse and it's lifting the rider out of the seat. Sometimes taking the bike off the ground. We need to see if they can improve that for next.

"I'm sure it will be mentioned in the Safety Commission. It's rideable, but with a MotoGP bike with so much power those small bumps are what can make it all go wrong."

The Pramac Ducati rider improved from 13th in FP1 to ninth in FP2, despite a far from perfect afternoon lap.

"FP1 was good. We used the same tyre all practice and set my best lap on the last lap," he revealed. "In the afternoon, we made a bit of a strange combination; we put a used front from this morning and a new soft and it didn't really perform like I wanted it to.

"It was weird because the traction was less, but too much grip on the edge on the first touch of the throttle. So I was pushing the front on first touch of the gas and spinning on the way out."

Asked why he tried what sounds like an unusual tyre combination, the Englishman replied:

"We're doing a few things to try and help me for the beginning of the race, so we're doing some strange combinations to collect some data and improve my feeling. We've got to try something because the first few laps are where I'm losing most of my time. Mid-race my lap times are good, but at the beginning I'm struggling a bit.

"At the end of FP2 we went with the medium front and soft rear and it was a good combination but I was trying too hard to make the lap time. I was too far behind the other guys, so I had to make a big effort and come from a long way to try and improve.

"I was too much on the limit; making a few mistakes and not good lines. It wasn't a clean lap but I'm happy to be in the top ten. That's the main thing and we know where we can work for tomorrow."

Team-mate Danilo Petrucci was twelfth fastest.

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