Mercedes test row hangs over Monaco grand prix
The continuing tyre debate in Formula One acquired a new facet over the long weekend, as details emerged of a 1,000km test Pirelli conducted in Barcelona after the Spanish grand prix. Red Bull and Ferrari have led official protests against the test, which is thought to have been conducted using the 2013 Mercedes car. This adds another layer of complexity to the ongoing debate over whether Pirelli will be allowed to change its 2013 specification rubber mid-season. Pirelli announced that it would make the changes to the rear tyres before the Canadian grand prix, but this intention is being held up by three teams – chiefly Force India, with Ferrari and Lotus joining the current impasse – who have refused to sign off on the replacement range. (You can follow the ongoing saga of Pirelli's 2013 F1 tyres in the links below this story.)