Quote Originally Posted by SGWilko
OK - But I seem to recall it being exlained that Ferrari had photographic evidence of the Michelin shod cars trundling down the pitlane, and were able to demonstrate the increasing width of the tread as it neared the carcass.
IIRC the photographic evidence was twofold, one of the used discarded Michelins post-race with wear clearly visible on the shoulders, and another of Michelins deforming under hard cornering showing the shoulder of the tyres in contact with the ground.

Personally I think Michelin was within the wording of the regulations but not the spirit, but then again the regulations regarding tread were extremely vague until this incident happened so...