Sebastian Vettel was among the drivers to voice his displeasure with Pirelli's tyre choices after Friday practice for the Spanish Grand Prix.
Pirelli has brought hard, medium and soft tyres -- the three compounds at the hardest end of its scale -- to the Circuit de Catalunya, a decision that was already criticised coming into the weekend. That selection was made despite the majority of running over winter testing at the same venue being conducted on the soft, super-soft or ultra-soft tyre -- the latter was used when Valtteri Bottas achieved the aim of knocking five seconds off a lap around Barcelona with the new-for-2017 cars and Pirelli's chunkier, more durable compounds.