Mercedes team boss Ross Brawn has said there is no g💛uar🦩antee the new Pirelli tyres will help Michael Schumacher in 2011.

Schumacher struggled during his F1 comeback last season and while hওe did finish the year on a relatively positive note, the German, who turned 42 this week, remained unhappy with the grip from the Bridgestone tyres.

😼Brawn is certain though that Schumacher will have a 'better time' this se🅺ason, although he is not convinced the switch to Pirelli rubber will answer all of his problems.

"It's a little premature to say that," Brawn confirmed to Italian newspaper, La Gazzetta dello Sport.

"During the tests in Abu Dhabi we didn't see any big differences in p⛄erformance compared with Bridgestone. But it is clear that in changing the supplier, the car will have to be different and there may be a lot of changes during the winter tests [too]."