The strength of the P Zero White medium tyre following a start in which most used the soft P Zero Yellow allowed the top 15 to complete two stops only on the demanding Shanghai circuit, Pirelli said. Formula One’s exclusive tyre supplier had anticipated increased wear as a result of very long corners and high G-forces, but the 2014 tyres’ increased durability allowed Mercedes’ Lewis Hamilton to use a two pit stop strategy to win, following a long second stint.