Nico Rosberg warns Mercedes has major tyre problems in Bahrain despite topping practice
|By Edd Straw and Sam Tremayne||Friday, April 20th 2012, 13:10 GMT|
Nico Rosberg played down his chart-topping form in the second free practice session in Bahrain, cautioning that Mercedes' tyre overheating issues are 'probably the worst they have been'
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