Once you have identified the cause of a problem, usually a solution is near. At least that is what Nico Rosberg hopes. The heavy rear tyre degradation his Mercedes has been causing in races has been the main issue behind his poor 2011 results so far. But the team have been working flat out to eliminate the MGP W02′s shortcomings – and hopefully it will show this weekend. Rosberg dominated Friday’s opening session in Montreal, but speaking afterwards the German remained very much aware that striking the right balance between practice and race pace is where the true challenge lies