if there is no grooves on racing cars tyres then the cam attempt to an accident while drifting
1.car can move out of track as it takes turn at speed of more then 60 km ph
2.car can take air trams(take flips in the air)
3.reduce sprrd and bad starting
nitrogen
Nitrogen
Deeper grooves improve traction for off road use but are noisy when on road use.
It's nitrogen.
Tires need the grooves to be able to get a grip when weather is not the best. They provide a place for water, ice and snow to go and allow the rubber tread to make contact with the road. Racing cars often use tires with no grooves at all, but the weather has to be dry and the pavement clean. On a passenger car, even a little water can cause hydroplaning, where the tire is on water rather than the pavement.
Because they have to get a grip in mud, grass and soft ground in general.
so they can have more traction
usually, racing slicks made by Goodyear or Firestone, if its a wet track rain tires.
There are different types of tires depending on what kind of racing they're doing. But pretty much all racing tires tries to be grippier than regular tires. This usually means that they wear out faster, and create more road noise than regular tires, which no one really cares about if can win them the race.
tire tread is for better traction on slippery surfaces smooth tires are for racing at hi speed
Nitrogen It's volume changes less than air as the tires temperature changes.
When it rains, cars sometimes hydroplane because the water underneath the tires supports the weight of the car and causes it to loose traction. Grooves give another channel for water to escape. As for off-road cars, the tire grooves are not much deeper rather they are larger and have more room to go up and down. In my Jeep Wrangler, the tire grooves are the same depth as an Acura TL and a Honda minivan. Maybe on other off-road cars they help the car travel through gravel, rock, sand, and snow to gain more traction.