Pirelli 's tires have become biggest talking point of Formula One season . Supplier 's test driver says teams have been struggling to find right strategy . It has allowed some of the lesser-known drivers to make their name . Comment:
Pirelli 's tires have become biggest talking point of Formula One season . Supplier 's test driver says teams have been struggling to find right strategy . It has allowed some of the lesser-known drivers to make their name . Pirelli 's motorsport head says company decided to make tires more prominent .