Following the tire problems with the Bridgestone rears in Assen, their investigation turned up no obvious problems, other than overheating - Sport Rider Magazine...
HOHENSTEIN, ERNSTTHAL, GERMANY, JULY 6 – What happened to the rear Bridgestone tires of Valentino Rossi and Ben Spies at last week's Dutch TT remains a mystery, despite an in-depth analysis by Bridgestone.
Shinji Aoki, Bridgestone's manager of motorsport tire development, briefed the media on the progress of the investigation following the end of day rider briefings at the German Grand Prix. Most of the riders believed Bridgestone was being sincere when they said the tires weren't defective, but Repsol Honda’s Casey Stoner wasn't as forgiving.