The big news following the race debut of Pirelli's latest tyre specification is that Mercedes' long struggles could finally be over. Ferrari thinks the move to the new specification of combining the 2013 compounds with the 2012 kevlar construction, has hurt the Italian team's performance.'BETTER FOR SOME THAN OTHERS'Mercedes' Ross Brawn said: "There is no doubt that it will be better for some than it is for others but I still have no idea where we are."The tempting analysis, of course, is to surmise that Lewis Hamilton's first win of the 2013 season, from pole position in Hungary, showed that Mercedes is the big winner of the tyre shake-up.Brawn warns: "It doesn't mean the same will happen in Spa."Paul Hembery, Pirelli's motorsport boss, thinks Hungary might be evidence Mercedes' troubles are finally over.Hembery said: "The big difference is that they didn't have the overheating problems that we saw them have on the rear tyres in the past 18 months."If they've solved those problems, Mercedes will be very strong in the second half of the season."FERRARI SLAMS NEW TYRESAt the same time, in a post-race media statement, Ferrari made it clear that the new 2012/2013 tyres "definitely did not suit" the F138 in Hungary.Ferrari said: "Pirelli's choice contributed to artificially altering the hierarchy in the field, something that has not pleased the president (Luca di Montezemolo) or the men of the Scuderia."This topic will be the subject of further debate in the near future."Ferrari's team boss, Stefano Domenicali, said: "We need to understand if it has to do with the structure of the tyre, or whether it will depend on the compounds that are taken to each race."What is clear is that Mercedes has solved their problems with these new tyres."