We were braking heavily for knickerbrook chicane when it went. I thought someone had rear ended me - the back end started bouncing up and down and the brakes were not as effective - tirewall approaching at speed but it stopped in time.
Having now had a chance to look at it , the only damage is the severed valve neck. I thought at first the tyre had moved on the rim slightly , cutting the valve neck but this doesnt seem to be the case. Must have picked up something from the track.
