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Q&A with Bridgestone's van de Grint 05 Feb 2007

Kees van der Grint (NED) Ferrari Bridgestone Engineer.
Formula One World Championship, Rd 18, Brazilian Grand Prix, Practice Day, Interlagos, Brazil, 20 October 2006

Bridgestone completed an extended four-day test at Valencia in Spain last week. It was the first opportunity for the teams to conduct comparison runs of two of Bridgestone's four planned tyre specifications for this season.

At previous winter tests only one specification of dry grooved tyre had been available (Hard in Barcelona and Medium in Jerez), but last week teams were supplied with Medium and Soft specification tyres. These are the specifications planned for use at the first round of the 2007 season, which will take place in Australia on March 18.

With a further four three-day group tests before then, Kees van de Grint, Bridgestone Motorsport’s head of track engineering operations, discusses progress to date…

Q: Can you clarify how many specifications of tyre Bridgestone will be producing this year?
KvdG:
The current plan is to produce four specifications of dry weather tyre which will be known as: Hard, Medium, Soft and Super Soft. From these four specifications two will be chosen for use at each Grand Prix.

Q: What were the aims of this week's test and which tyres were tested at Valencia?
KvdG:
This week's test was the only opportunity for the teams and drivers to conduct comparisons of the medium and soft Bridgestone specifications prior to their use at the Australian Grand Prix in March. It was also a good opportunity to ascertain what the potential lap time difference may be between those two specifications.

Q: Did all the drivers manage to complete comparisons between the soft and medium tyres?
KvdG:
The majority of drivers this week did run on both specifications, giving them a feel for what to expect in Melbourne.

Q: And what was the feedback?
KvdG:
We were pleased to see that the soft tyre performed as it should in comparison to the medium specification, providing more grip and a faster lap time. As you would expect from a softer tyre, there was also a little more graining and a higher rate of degradation on Thursday than with the medium specification but those drivers who ran today will have found that the drop off improved over the day as track conditions also improved. Just as importantly, however, it was good to see that the medium specification was providing a very consistent level of performance for the drivers.

Q: What was the time difference between the medium and soft specifications?
KvdG:
First impressions suggest an average lap time difference of half a second between the medium and faster soft specification.

Q: How are the teams adapting to the new tyres?
KvdG:
The teams have been adapting very well and it is clear that they have moved on significantly since November in terms of their knowledge and use of the tyres. They have become more confident and their understanding of the Bridgestone tyres has evolved enough for them to be concentrating more on fine tuning their cars to the tyres, not having to make big changes. From studying the lap times I think it is going to be very close this year. And now that many of the teams have launched their 2007 cars it has been interesting to see the differences in design approaches between them.

Q: How is Bridgestone handling the practical side of supplying all the teams this year?
KvdG:
It's a challenge we are enjoying and we have employed additional staff to fulfil the servicing requirements of all 11 teams this year. Bridgestone's technical department in Japan has also seconded extra engineering staff to our F1 facility in the UK.