Pirelli motorsport director Paul Hembery has confirmed the tyre manufacturer is on schedule for its return to Formula 1 in 2011.
Official test driver Nick Heidfeld spent two days testing the PZero Formula One tyres at France's Paul Ricard circuit, working on both constructions and compounds.
The tyres performed as expected with Hembery declaring himself delighted with the way preparations are going for its Formula 1 return.
"We're very happy with the progress we've made so far, which actually puts us slightly ahead of where we expected to be at this point in time," Hembery said.
"We worked through an initial development programme that has given us a useful insight into the performance of our prototype tyres under a wide range of conditions, corners and speeds.
"We've been hugely encouraged by what we've seen up to now, and that's been helped by both Nick's clear and precise feedback, as well as all the different possibilities afforded to us by the Paul Ricard circuit."