Tyres can be no wider than 355 mm (14 in) and 380 mm (15 in) at the front and rear respectively. Unlike the fuel, the tyres bear only a superficial resemblance to a normal road tyre. Whereas a roadcar tyre has a useful life of up to 80,000 km (49,710 mi), in 2005, a Formula One tyre is built to last just one race distance (a little over 300 km (186 mi)). This is the result of a drive to maximize the road-holding ability, leading to the use of very soft compounds (to ensure that the tyre surface conforms to the road surface as closely as possible).
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