Michelin has taken the highly unusual step of withdrawing not just one, but both rear tire compounds from use at the Termas de Rio Hondo circuit in Argentina.
Instead, a different rear tire with a stiffer construction will be issued in the morning, with the teams being given an extra 30-minute session of warm up in which to find a set up for the tires.
The decision was taken after Scott Redding suffered a catastrophic tire delamination with the Pramac Ducati during FP4. The incident happened on a medium rear tire which had been used for just seven laps, according to a statement on the official MotoGP.com website.
Redding managed to stay aboard, fortunately, but the rear of his bike was destroyed by a large strip of rubber which had detached itself from the tire. That strip of tire also hit Redding in the back, leaving a massive bruise.
The incident caused FP4 to be red-flagged, then, rather bizarrely, restarted once again, before being stopped for a second time. However, it was not immediately clear what had caused Redding’s tire to self-destruct, and so the session was allowed to continue, as was qualifying.