Formula One champions Ferrari have suggested they could lodge protests over several of this season's races after accusing rivals of using illegal tires.
Such action could mean the championship, on a knife-edge with Michael Schumacher one point clear of Colombian Juan Pablo Montoya with three races to go, is decided in the appeal courts rather than on the track.
Ferrari uses Bridgestone tires and claims that the Michelin tires are in spec before race but change to allow more tread to have contact with the road during racing.
Ferrari claims that the front tires on the main Michelin teams increase in width after start of race.
The governing International Automobile Federation (FIA) has said there will be post-race checks, starting with Ferrari's home Italian Grand Prix at Monza next week.
Michelin has challenged Formula One's governing body to disqualify half the grid at the next Italian Grand Prix after the FIA raised doubts about their tyres.
"If the FIA want to disqualify 10 cars from the final results, then go ahead," Pascal Vasselon, Michelin's Formula One programme manager, told Italy's Gazzetta dello Sport newspaper on Tuesday
He said that the French company's tires were legal and Michelin saw no reason for change at a decisive stage in the championship.
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