Bad tires are giving teams a tough go in Monza.
"Larger wheel and tyre sizes reflect modern market trends," Pirelli said in a statement.
Mercedes swept the day in Sepang.
Pirelli ups the brand's involvement in the sport.
Final pre-season test gets underway in Bahrain: 30 sets of tyres per car
It looks like Pirelli won't be having the same troubles this year.
More torque from the new engines, means tougher Pirellis are needed.
Motorsport.com selected the Mercedes "Testgate" saga as its number 7 selection for the too 20 moments of the year.
Are the 2014 Pirellis safe? Salo thinks so.
Reports concern Pirelli again! This time they are accused of not filing a report to the FIA that they had changed the construction of the tyres prior to the British Grand Prix.
Michelin pulled out of F1 in 2006, and since then, they have concentrated on sports car endurance racing along with their Green X Challenge program.
Bridgestone appears to be content as the MotoGP supplier plus the Firestone arm is happy with IndyCar.
Pirelli begins the 2013 Formula One season with a completely revolutionized P Zero range for dry weather and Cinturato range for wet weather.