Despite ending the day with a sizeable margin over his rivals in FP2, Lewis Hamilton says he isn't entirely pleased with his Mercedes following the first day of track running for the Spanish Grand Prix.

The championship leader topped the timesheets by four tenths of a second in FP2, though his best lap would fall just over three hundredths shy of Nico Rosberg's benchmark from the FP1 to place him second overall.

Indeed, though Hamilton was satisfied with the progress made over the course of the day, he wasn't happy about the car's inconsistency, even if he admits the gusty conditions have added to the challenge.

Related Articles

"At the moment I'm not [happy with the balance]," he said. "I don't really know why. It feels very inconsistent throughout the lap, because I think the wind is up and down. In some places you're getting gusts, sometimes you're not getting a gust. Sometimes it's oversteer, sometimes its understeer. Sometimes it's fine, perfect, then the next lap it's different, so that makes it very difficult to find the set-up.

"I don't know if there is less grip, because this is what we started with today - it's like Melbourne. It's definitely harder to drive because sometimes the car's perfect, sometimes it's understeer, sometimes it's oversteer, so it's actually really hard."

Asked whether he thinks Rosberg is potentially a bigger threat in Spain, Hamilton is under no illusions that he will be, but is confident he can be better.

"I think he's going to be quick. I just need to be quicker."