Incubus
Champion Elect
Just having a poke around on the net and most of the stories seem to suggest there was a manufacturing problem with the Michelin tyres bought to the race. Running at higher pressures reduced the problem but didn't solve it
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I'm not sure about that point FB, I vaguely seem to remember Michelin after the initial incident to R Schumacher were planning as an emergengy measure to fly the Barcelona-specification tyres to Indianapolis but had to pull out of that because tests conducted on these revealed the same problem.