Paul Hembery has revealed that next year's Pirelli tyres will be significantly different.
The teams will get their first taste of the Italian marque's 2013 rubber during free practice in Brazil late this month.
Pirelli's F1 boss Hembery told Brazilian journalists on Thursday: "The (2013) tyres will be significantly different to this year, which will challenge the teams because the cars will be virtually the same, with almost no change in the regulations.
"The difference (in tyres) from 2012 to 2013, however, will have a strong effect on the aerodynamics of the cars, and so the teams will have to work hard," the Briton is quoted by Totalrace.
He said there will also be a greater difference between the various compounds in 2013.