Pirelli motorsport director Paul Hembery says the Italian tyre maker is critically concerned about making any modify to the tyres as it could change the aggressive situation in Formula 1.
All teams are in concurrence this season that getting the tyres in to the true operational casement is a key constituent to performance, because cars are now so same in provisions of their pace.
Also many teams struggled to open the top secret of Pirelli's 2012 rubber and help that condition Pirelli is looking at a new hard compound that will have a wider operational range and should therefore be a help to teams who are struggling to get into the right temperature window.
"There is a big point to make that if we make a change, particularly with the way the championship has been played this year so close, we don't want to risk creating an advantage for a particular team," Paul Hembery told Autosport.
"So if you imagine, suddenly, for races 10, 11 and 12 one team starts running away, then we're going to come under all the criticism.
"We'll test because we want to understand the effect and impact, but it's not necessarily going to happen that we bring it to the races. We've got to be very careful because there's a big difference with the teams on where they are with the tyres at the moment.
"We talk to the technicians, so then they're trying to find the success of finding that key of keeping the performance at the highest level for as long as possible.
"They would be rather upset, I think, if suddenly it was a little bit easier, and the people that have worked so hard felt that they were getting there, and another team then gets there. You need to be careful with things like that because it changes during the championship."
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