Bira - AtlasF1 palsta - sivu 37
Do you actually realize the
2002 Michelin document isn't even quoting the regulations?
Spot the difference
The regulations:
quote:
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b) All dry-weather tyres must incorporate circumferential grooves square to the wheel axis and around
the entire circumference of the contact surface of each tyre.
c) Each front dry-weather tyre, when new, must incorporate 4 grooves which are :
- arranged symmetrically about the centre of the tyre tread ;
- at least 14mm wide at the contact surface and which taper uniformly to a minimum of 10mm at the
lower surface ;
- at least 2.5mm deep across the whole lower surface ;
- 50mm (+/- 1.0mm) between centres.
Furthermore, the tread width of the front tyres must not exceed 270mm.
d) Each rear dry-weather tyre, when new, must incorporate 4 grooves which are:
- arranged symmetrically about the centre of the tyre tread ;
- at least 14mm wide at the contact surface and which taper uniformly to a minimum of 10mm at the
lower surface ;
- at least 2.5mm deep across the whole lower surface ;
- 50mm (+/- 1.0mm) between centres.
The measurements referred to in c) and d) above will be taken when the tyre is fitted to a wheel and inflated to
1.4 bar.
e) A wet-weather tyre is one which has been designed for use on a wet or damp track.
All wet-weather tyres must, when new, have a contact area which does not exceed 280cm² when fitted to the
front of the car and 440cm² when fitted to the rear. Contact areas will be measured over any square section of
the tyre which is normal to and symmetrical about the tyre centre line and which measures 200mm x 200mm
when fitted to the front of the car and 250mm x 250mm when fitted to the rear. For the purposes of establishing
conformity, only void areas which are greater than 2.5mm in depth will be considered.
Prior to use at an Event, each tyre manufacturer must provide the technical delegate with a full scale drawing of
each type of wet-weather tyre intended for use.
With the exception of race day, wet-weather tyres may only be used after the track has been declared wet by the
race director and, during the remainder of the relevant session, the choice of tyres is free.
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The Michelin 2002 document:
quote:
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Definition of a dry tyre
All dry-weather tyres feature mandatory grooves perpendicular to the wheel axis
and running continuously around the circumference of the contact patch.
When new, each dry tyre – front or rear – must feature 4 grooves that:
Are arranged symmetrically in relation to the centre of the tread;
Are at least 14 mm wide at the contact surface and taper uniformly to a minimum
width of 10mm at the lower surface;
Are at least 2.5 mm deep across the whole lower surface and spaced 50mm apart
between centres (with a tolerance of ± 1.0 mm).
The front tyres’ tread width must not exceed 270 mm.
Definition of a rain tyre
A rain tyre is one that has been designed specifically for use on a track that is wet or
damp.
Rain tyres must have a tread ratio equal to, or higher than, 30 per cent.
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Yeah, right! It's identical!
