Formula One: Pirelli defends Mercedes tyre tests as fair

DUBAI (AP) - Pirelli has dismissed allegations that it breached rules by conducting in-season tyre testing with Mercedes, saying it acted fairly and professionally over the test which it said offered no benefit to the German team.

The tyre maker, under fire for concerns its tyres were degrading too quickly this season, faces tough questions over the test which took place following the Spanish Grand Prix.

Red Bull and Ferrari launched protests over the test following Sunday's Monaco GP, which was won by Mercedes driver Nico Rosberg.

Pirelli Motorsport director Paul Hembery says the tyres tested were for the 2014 season so offered no competitive advantage to Mercedes. Hembery says several teams were offered a chance to test but Mercedes was the first to take up the offer.