Factory Yamaha's Ben Spies opted to concentrate on setting his bike up with the softer Bridgestone tyres during the first and only MotoGP free practice session at Aragon earlier today and will switch to the harder options tomorrow.

Spies said he was frustrated by the lack of track time this afternoon due to power failures but said his times at the end of 40 minutes were representative of what he and the bike can do.

“This morning was actually quite a good session for us; we were up to third position and then we opted not to change tyres and work on the set up. It seems everyone else tried the harder tyre in the end which worked a lot better so we’re looking forward to using that," said Spies.

"We picked which set up we are going to move forward on so the end result of the session was definitely not what the bike is capable of. Tomorrow should be good. I’m annoyed about this afternoon, it’s no one persons fault but it’s frustrating.”