Schumacher has failed to win only one race this season
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Michael Schumacher will have better tyres for the Hungarian Grand Prix but say his car will not improve before the end of the season, Ferrari say.
Technical director Ross Brawn said the team had stopped developing the chassis to concentrate on their 2005 car.
"The chassis is probably frozen for the rest of the season," Brawn said.
"There are small bits on the engine but most of the performance gain for the rest of the year will come from the work we are doing with the tyres."
The German has been in devastating form this year winning 11 of the 12 races this season.
However, he has had to fight harder for his wins in recent races as the likes
of Renault and McLaren have reaped the rewards of their development programmes.