Williams driver Valtteri Bottas says that the prime tyre could present a limitation to drivers at this weekend's Malaysian Grand Prix.
Bottas was ninth quickest during practice for the Malaysian Grand Prix at Sepang, although he squandered his best lap on options by running wide.
"We tried many things with the car today and collected a lot of data on the long runs so on the whole it has been a good day," he said.
"One challenge has been the difference in pace between the prime and the option tyre. The prime was sliding quite a lot and wearing out, so that will be something to watch out for over the weekend.
"I didn't have the best lap on my final run on...
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