“It's a similar situation to that which we experienced in Austin and, to be honest, it's something that needs to be addressed as a matter of safety. Scott and Mika did well not to crash today, never mind finish in the points, but both are bitterly disappointed with the results.”
Kallio, who finished 13th, confirmed that there had been no sign of the problems during practice.
"It's difficult to understand the tyre problem we had today. In practice yesterday I completed two race distance runs of 27 or 28 laps on the same tyre, with the same settings in the bike, in almost identical conditions and there was no problem.
“Today, after just six laps, the rear grip dropped off massively while I was running fifth and I couldn't maintain the lap time. As the race progressed and the rear continued to deteriorate it started inducing chatter, which was causing a lot of problems on corner entry.
“I'm really disappointed, as I thought we'd done everything right this weekend, but today was a disaster."
The Moto2 class does not race at Laguna Seca and will return to action at Indianapolis in mid-August.