Pirelli explains the causes for the incidents in Silverstone.

After extensive investigations, Pirelli has cited who was the causes for the incidents in Silverstone: 

- Rear tyres that were mounted the wrong way round: in other words, the right hand tyre being placed where the left hand one should be and vice versa, on the cars that suffered failures.
- The use of tyres pressures that were excessively low or in any case lower than those indicated by Pirelli. 
- The use of extreme camber angles. 
- Kerbing that was particularly aggressive on fast corners, such as that on turn four at Silverstone. 

The rear tyres to be used in Germany have a Kevlar construction that replaces the current steel structure with the re-introduction of the 2012 belt, to ensure maximum stability and roadholding. The front tyres, by contrast, will remain unaltered. 

The tyres for the Hungarian Grand Prix onwards will combine the characteristics of the 2012 tyres with the performance of the 2013 compounds. Essentially, the new tyres will have a structure, construction and belt identical to that of 2012, which ensured maximum performance and safety. The compounds will be the same as those used throughout 2013, which guaranteed faster lap times and a wider working range. 

This new specification, as agreed with the FIA, will be tested on-track together with the teams and their 2013 cars at Silverstone in a session using race drivers during the previously scheduled young driver test.

Pirelli are also pushing for regulation changes that would allow them access to real-time data from the teams regarding fundamental parametres such as pressure, temperature and camber angles, in order to ensure the optimal functioning of tyres. 

Paul Hembery, Pirelli’s motorsport director said: “What happened at Silverstone was completely unexpected and it was the first time that anything like this has ever occurred in more than a century of Pirelli in motorsport. These incidents, which have upset us greatly, have stressed the urgency of the changes that we already suggested - which will be introduced during for free practice in Germany on Friday. We would like to acknowledge the willingness of the FIA, FOM teams, and drivers to act quickly to find an immediate solution to the problem. In particular, the adoption of winter tests, arranged with the FIA, that are more suitable for tyre development and the possibility of carrying out in-season testing will contribute to the realisation of tyres with increasingly improved standards of safety and performance. I’d like to re-emphasise the fact that the 2013 range of tyres, used in the correct way, is completely safe. What happened at Silverstone though has led us to ask for full access to real time tyre data to ensure the correct usage and development of tyres that have the sophistication we were asked to provide and extremely high performance that has lowered lap times by more than two seconds on average. While we wait for a change in the rules, we will introduce tyres that are easier to manage.”