French tyre manufacturer Michelin will become the exclusive tyre supplier to the A1GP series from next season, it was announced on Monday.
The series's cars has used Cooper tyres until last season.
Michelin tyre technicians have already been working with the A1GP technical personnel, covering over 4,000 km with the "Powered by Ferrari" car that will be used in the 2008/09 season.
"We are very pleased to be working with Michelin for the next three seasons," said A1GP General Manager John Wickham. "Michelin has a vast amount of experience in motorsport and will enhance the competitive nature of our series.
"We commenced the test programme at the beginning of June and have now specified the most suitable tyre compound and construction for our new A1GP Powered by Ferrari car. "
He added: "We have run 29 sets of slick tyres and three sets of wets so far. There are small differences between the spec of the slicks, about 50% are 'control' spec so 15 or so 'test' sets."