Bridgestone will reduce the level of grip available to MotoGP riders for the 2009 season in an attempt to combat rising corner speeds.

In line with the wishes of MotoGP boss Carmelo Espeleta, the spec tyres won't offer as much grip as either the firm's own tyres or the Michelins did in 2008.

During the two-day test at Valencia, the company only made 12 tyres available to reach rider with only two compunds choices front and rear.

"Considering it is the first time that we are producing MotoGP tyres for everybody in a sole tyre supply situation, I think we have made a good start," said Bridgestone race manager Tohru Ubukata.

"We have used the foundation of our 2008 tyres for these new  specs but made some important alterations to ensure that the tyres have a wide operating window and can work well  for all teams and riders. We have reduced the overall grip level of the tyres in order to accomplish this and the  feedback from the riders has been encouraging."