Silverstonethe second home of Pirelli - marks the fifth round of the GP2 series. Pirelli has nominated the P Zero Orange hard and P Zero White medium compounds. Silverstone is a high-paced, demanding track that challenges both man and machine.Pirellis racing manager Mario Isola says : Were set for another busy weekend. For GP2, we are bringing the hard and medium tyresa combination we have not had in GP2 so far this year. Silverstone is a track that is quite abrasive in the parts that have not been resurfaced, and it demands a lot from the tyres, so the medium and hard compounds seemed the natural choice. We have seen a variety of strategies used this year already, and tyre management is set to play an important role once again this weekend.The challenge for the tyres:The fastest and most demanding corner at Silverstone is Turn 9 (Copse), which the cars take at high speed, generating substantial lateral force. Tyre tread temperature can exceed 100 degrees centigrade at this point, making good lateral grip essential.As well as several high-speed corners, Silverstone is often characterised by a wide variety of climatic conditions where ambient temperatures can range between 15 to 30 degrees centigrade. This could mean that the wet-weather tyres come into play once more.Although partially resurfaced in 2011, the track surface at Silverstone can be quite abrasive, which further increases tyre wear. The tyre structure must also cope with extended periods when the cars are at top speed and full throttle simultaneously.