To test the new F1 tyre, Pirelli signed Nick Heidfeld. A 2009 version of a Toyota Racing chassis is being used to test the tyres. The testing is taking place during the second half of the season. In September 2010, Heidfeld was signed by Sauber to race the remainder of the season. Pirelli then hired former GP2 and Renault F1 driver Romain Grosjean to test for them.