Late decision on tyre markings expected

Bridgestone is still unsure about how it will mark its tyres for the Australian Grand Prix to make them visibly distinguishable

The Japanese tyre supplier will have to use a mark to make its two types of tyres distinguishable from each other after a last-minute rule change came into play for the 2007 season.

Although it was originally suggested that F1 could follow Champ Car's route and paint the sidewall of the softer compound red, Bridgestone ruled out the idea.

Another suggestion was a solid white circle that would be visible when the tyre was in motion.

A Bridgestone spokeswoman said that a decision on how it will mark the tyres could be delayed until late on Wednesday, just two days before the first practice session for the Australian Grand Prix.

The company's head of track engineering Kees van de Grint confirmed however it will be the softer tyre that will be marked.

"Bridgestone is still assessing the best method for marking the tyres but it is expected to be placed on the Option tyre of the two specifications," said van de Grint.

"This will add to the work of Bridgestone's tyre fitting staff but we anticipate dealing with this swiftly and efficiently."