Formula One racing's third and final in-season test of 2014 begins at Silverstone on Tuesday, with a host of young drivers set to be given a run out alongside the established stars.But perhaps the most intriguing part of the test will be Pirelli’s trial of 18-inch tyres. F1 cars currently use 13-inch tyres, but the Italian manufacturer has suggested that running with larger wheels and tyres would lead to greater technology transfer between F1 tyres and road car rubber. Pirelli have stressed, however, that they'll only continue with development if F1's various stakeholders wish to proceed.Lotus have been given the responsibility of demoing the concept tyres on their 2014 car on...
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