Why doesn't nascar use rain tires?

May be...

Rain tires have grooves in them, which means less tire surface area touching the road. Less surface area means less traction, and less traction at those speeds mean a lot more crashes. It's both a speed thing and a safety thing.

Nascar does use rain tires on ROAD COURSE tracks. As for the Oval's , the lack of grip would jeopardize the drivers saftey.

Presumably the reason has something to do with rooster tails.

Particularly in Formula One in the rain, there are vast plumes of water kicked up behind a car. With 30 odd NASCARs that might cause a problem with already limited visibility. Also, when you consider that NASCAR runs races at night and without lights, following a rooster tail would be impossible.

its not the cars its the wear pattern of the tires on oval tracks. since you're only making left turns the right sides wear faster and the tread would wear off. on road courses you can use rain tires because there is a more equal distribution of wear amongst the 4 tires.

also the IRL does not run on ovals in the rain for this reason as well

It already costs a lot of money to build these car and race them. To race in the rain would just cost a lot more money to teams by tearing up more cars.

They did use them once in a Bush race in Canada. If I remember correctly, very few cars had wipers installed & Robbie Gordon got penalized for a payback. So NASCAR has used them on an unbanked track. Supposedly the banked tracks are too dangerous.

The real reason why NASCAR doesn't use rain tires is because the cars are designed to run on a dry surface

They might on a road course, as they did in Montreal last year in the Nationwide Series.

Racing in the rain on an oval isn't practical for a few reasons.


The cornering speeds are slowed dramatically, even with a rain tire. When cornering speeds go down so do the straightaway speeds. The speeds they'd be running at would make for a boring race.

When a car spins on a wet track there's a lot less friction, meaning less speed gets scrubbed off. You've now got cars hitting the wall and being unable to stop or regain control of their cars. Definitely a safety issue.

There's also some serious visibility issues in the rain.

nascar says the cars are to heavy (3400) that's bull! so whats the real reason?

they could control the race, make everybody come in and change tires under a Competition yellow!

then make then race with rain tire and a wiper!

SO WHAT THE REAL REASON THEY DON'T DO THIS?

Smooth (slicks) tires provide more surface area.build my upper chest