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Michelin Le Mans 24 Hours : Dissection and analysis

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PRESS INFORMATION


Le Mans, Friday, June 15, 2007
24 Hours of Le Mans



AT MICHELIN, WE ARE REALLY SHARP!


Certain Michelin tyre fitters, called 'dissectors', have a special art and manner to handling a
knife while they cut or strip tyres.

Re-cutting… for extra water clearance

In very heavy rain, Michelin's technicians may be called upon to cut extra grooves in the pattern of rain tyres
to transform them into 'maxi' rain tyres by enhancing their water clearance capacity.

"This technique is only rarely used at Le Mans," points out Matthieu Bonardel. You don't get the phenomenon
of  standing  water  because  of  the  good  drainage  of  the  portion  of  track  that  is  generally  open  to  everyday
traffic. Also, the drivers want to cover as many stints as possible with the same tyres, and the more you re-cut
a tyre the less durable it becomes. We only re-cut if we haven't got the ideal rain tyre for a given situation, as
we did yesterday.»
Extra  circumferential  grooves  can  be  added  for  enhanced  lateral  grip,  while  extra  grooves  to  the  shoulders
improve traction."


Dissection and analysis

After  their  long,  demanding  workout  on  the  track,  the  tyres'  ordeal  is  not  entirely  over  since  a
proportion  of  them  is  consequently  dissected  and  analysed,  a job that calls for an extremely trained
eye...

As soon as tyres that have raced are returned to the Michelin compound from the pits, they are removed from
the rim and a proportion of them is set aside for dissection. During the Le Mans 24 Hours, two 'dissectors' are
on permanent standby for at least the first eight to ten hours of the race. At other events, the technicians who
look after the prototype and GT teams dissect the tyres themselves.
The aim is to analyse how the tyre has functioned on the track with a view to passing on information that could
serve for the stints to come. The tyres are cut and their cross-section is inspected to make sure their structure
hasn't become deformed in any way and ensure that the tyre has performed in accordance with expectations.
Information for the teams

"If all is OK, we can authorise those teams that so wish to double or triple stint," observes Michelin engineer
Alain Charnier "We  inform  them  that  the  wear  of  their  tyres  is  perfect  and  that  they  can  cover  more  stints  if
they want to, but we never force them. That said, we may occasionally warn against triple stinting."

The  other  reason  for  dissecting  the  tyres  is  to  ascertain  why  a  punctured  has  occurred,  essentially  for  the
benefit of the media. It is possible to see whether a puncture was caused by an impact or by perforation of the
tread. Tyres occasionally come off the car and are left on the track, in which case it can take some time for the
technicians and team personnel to recover them. At other times, the cover is so damaged that it is impossible
to analyse it. In the vast majority of cases, however, the dissection process reveals the true story.


Two 'Dissection' sessions will be open to the media (in limited number):
Saturday at 18h00  and Sunday at 11h00.

To assist in a session please contact Laurent Chetrit,
seat # 2.100 in the Media centre or at + (33) 06 80 00 19 75.

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