Now that the run is over, here's the post I tried to make twice a few minutes ago. Oh, yes -- Betty Howard just informed me that this run is George Poteet's 26th run over 400 mph.
On the down run the course watchers reported finding bits of rubber on the track after the Speed Demon went by. And when the crew pulled the bodyoff the car in the pits they found one of the front tires had been chunked about 1/3 of the way around. They proceeded to change the tire.
They also proceeded to relieve the notches in the pan under the tires, using files and hammers and spray lube. Mike Cook was seen wielding a spray can - might have been putting a bit of paint on the shield to show if there was contact.
Whatever, the tire bits were located at the part of the course where the car's speed would have been greatest - so the tire's growth would have been at maximum. Here's the tire: