NASCAR tires look completely bald, but that's not because they are worn out. It is by design. On a dry track, tires can generate more traction if more of their sticky rubber is in contact with the ground. Putting a tread pattern on the tire helps in wet weather, but in dry weather it is better to have the whole tire touching the ground. That's why NASCAR races stop whenever the track is wet.
Link: http://entertainment.howstuffworks.com/nascar5.htm On the road courses at Sonoma and Watkins Glen, each team has at least one set of rain tires. You wouldn't kill yourself if you ran in the rain on a road course (you probably would if you did it on an oval), so the protocol for rain is to throw the yellow, get everyone in and change to rain tires. I'm not sure if they ever have done it, but they can.
Not in the Cup Series, but the Nascar Nationwide Series uses rain tires and windshield wipers for road course racing when necessary. The first time the series had to use them was on August 2, 2008 at Circuit Gilles Villeneuve in Montreal, Quebec, Canada.
The Cup Series did in practice in the late 1990s in an exhibition race in Japan, and again in Watkins Glen. The Nationwide Series raced in the rain in Montreal, Canada in August of 2008. All of the tracks so far have been road courses.
Those tyres are called full wet weather tyres or full wets. They are heavily grooved tyres that can provide maximum grip even under heavy rain. There is also a slightly less grooved tyre called the Intermediates which can be used under conditions of light rain or drizzle. Full wets are significantly slower than intermediates which are slower than the dry tyres or slicks are they are more commonly called.
F1 teams use Nitrogen to fill the tires because of its low dilatation compared to air, a small dilatation in a F1 tire will result in unbalancing the car.
nitrogen
suspension.
Some are directional like the eagle F1, however most are not directional.
They use air filled tyres, which is why you see them getting punctures.
F1 tyres are filled with Nitrogen since it is a more stable gas than air
Soft tires are better because they are smooth on the track which gives them more speed.
Please be careful with that f1 key.
All teams have access to a live weather radar and hence can predict when rain is approaching the circuit.
so that less friction is caused, and to improve speed
max height 950 mm max width1800 mm with tires
If your stuck doing something hit F1 and it should help you out.