Tyre

Tyres
F1 TYRES
Dry Tyre	Intermediate Tyre	Wet Tyre
Tyre pressure :about 1.1 bar
Formula One tyre for dry surfaces is a colossus of 660 mm in external diameter and 350 mm wide, containing four longitudinal grooves of at least 2.5 mm imposed by the Depth Regulations. These grooves are symmetrically placed from the centre of the tyre tread and spaced 50 mm apart. Far from being just an altered slick, the dry surface tyre is a completely new concept, introduced to F1 with the sole aim of reducing the size of the ground contact area, i.e. the surface which ensures grip, resulting from the contact of the rubber compound and track. The aim of the regulations: to reduce the speed of the cars on corners... even if this means lost sleep for the manufacturers' design offices.	Fine to moderate rain, precarious gripping conditions but which do not justify using Wet tyres: intermediates are required. They have a special role and a wide range of uses: on a drying track, they must evacuate the film of water but also remain competitive on the dry without deteriorating too much. For this reason, quite discrete sculptures are used.	As well as the constraints of compound and structure explained above, the tyre for rain ;full wet;- must meet another equirement: to evacuate the film of water which infiltrates between the tyre contact area and the track. If this film is too great, the tyre loses all grip: resulting in aquaplaning. Regulations allow three different types of wet tyres by race. Generally, one is an intermediate type, the other two are ;wet; types, for soaked tracks. These types of tyre can only be used when the track has been declared;wet; by the race director.
Life : from 80 km to 200 km, depending on the compound	Life : extremely variable depending on weather conditions	Life : up to the total length of the race, depending on conditions.
from 80°C to 100°C	from 40° C (wet track) to 100° C (on the dry).	from 30°C to 50°C
As an additional note;nearly all Formula 1 teams uses NITROGEN for filling tyre. .The tyres are filled with a special nitrogen rich, moisture free gas to make sure the pressure will not alter depending on where it was inflated (this gas does not expand when hot) and NITROGEN holds tyre pressure for longer than air.A 20% Tyre pressure drop reduces tyre life by 15%.