Riders forced to race with harder tyres
18 October 2013 – The MotoGP field will be forced to use Bridgestone's harder tyre for Sunday's race at Phillip Island, after high levels of degradation were experienced during Friday practice.
Bridgestone determined that a new track surface increased overall wear rates, and subsequently acted to ensure that only the harder compound can be used on race day, although the softer rubber can still be chosen for practice and qualifying.
"We anticipated that the new tarmac at this circuit had the potential to make this circuit even more severe on tyres, so we analysed the tyres used by the riders today to see if this was the case," said Shinji Aoki, Bridgestone's Tyre Development Manager.
"Straight away it was apparent that the new surface offers more grip, which resulted in very quick times. Our analysis shows that the tarmac has made this track tougher on tyres, so for the race we have specified that riders use the harder rear slick options."
Yamaha's Jorge Lorenzo topped the timesheets on Friday with an effort of 1:28.961.