Pirelli will test an 18-inch tyre at next week's two day test at Silverstone in the hope of increasing the links between F1 and road cars.Currently Formula 1 cars run on 13-inch rims, however, Pirelli will trail a new concept during Wednesday's at the Northamptonshire venue.Formula E which starts later this year will run on 18-inch Michelin tyres and Pirelli will send Lotus' E22 out on their one-off tyres as they say it reflects market trends."The 13-inch tyre is no longer relevant to the everyday road user, because even an 18-inch tyre is used by standard vehicles these days," the Italian firm's Motorsport Director Paul Hembery said."While 18-inch tyres would be a big step...
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