As the yres will be developed principally for F1 the only real problem i see with this is the cometative advantage handed to F1 teams with GP2 connections on a plate.
It may well encourage greater interferance by the big teams in GP2 and make life difficult for the indies.
But it’s cost effective etc so the plan certainly has merit. Especially if Pirelli uses all the extra testing to make a more entertaining tyre for f1. However won’t the differeing downforce levels result in one of the series having a very difficult time with the tyre probably GP2?
If it happens we might see a few F1 drivers turn up at GP2 test sessions. There’s a few teams in there that could do with the money. But no reason why they couldn’t think up a rule to stop that happening.
A good idea I think. As already mentioned, it cuts the cost of manufacturing two different types of tyre for the two series. Also, it gives the chance for a GP2 driver in 2011 who may be promoted to F1 in 2012 the chance to get used to the type of tyre used in F1 – and with the lack of testing in F1 now that could be good experience to get said drivers up to speed more quickly.