FORMULA ONE: Tyre supplier Michelin have voiced fresh criticism of rule changes on the eve of the French company's farewell season in Formula One.

"Although the rules were changed in a bid to reduce costs, it is disappointing to note that a tyre manufacturer such as Michelin will have to carry 38 per cent more stock to grands prix this season than it did in 2005," the company's Formula One director, Nick Shorrock, has said.

Last year teams had to make one set of tyres last for qualifying and the race, but new rules allow a return to tyre changes.

That could favour Japan's Bridgestone, who were dominant with Ferrari in 2004 when pitstops for fresh tyres were last allowed.