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Q&A with Bridgestone's Hirohide Hamashima
What are Bridgestone’s conclusions from pre-season testing?

The major change of the narrower front tire is working well and has made a positive change to car grip balance. Teams have made good progress despite the limited dry running this month. Our objective of improving the warm-up of all of the dry compounds has been achieved and the tires are working well with the new, heavier cars.

How important was it to get dry weather in Barcelona?

After a lot of rain in Jerez it was good to get dry running here. The first test in Valencia was also dry, however with only seven teams there was a limited amount of data. If Valencia had been the only dry test, then there would be a lot still to learn in Bahrain. Of course, in Barcelona the weather was not perfect. The first day the track was green so it wasn’t until the second day that we had a good amount of rubber laid. There was rain on the third day, which didn’t help, but overall this final test has been very valuable.

How are the dry tires performing?

All four compounds were tested here in Barcelona. Considering the temperatures because of the time of year, we have seen performance in line with our predictions. This week has been a good validation of the good work of our development engineers in Japan. The super soft is a bit too soft for this severe circuit, but there have been good test results with this tire here. The soft tire was used for the majority of running, and we’ve seen some very long runs with this tire as teams evaluate strategy options for the latest rules. The medium and hard compounds have also given good results.

What are the crucial strategy considerations for 2010?

Because there is no refuelling the teams will be looking very carefully at pitstop strategies. We could see longer stint lengths than we have seen recently, and the tire constructions and compounds have been modified to suit. Of course, for those qualifying in the top ten there is the added consideration of having to start the race on the same tires which were used for qualifying. It will be interesting to see how this works in practice in the first races.

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