Mechanical Engineering - Automobile Engineering - Discussion

What are the grooves and crests? Please explain.

If there were no grooves the tyre would be in contact with the water patch and slips as water reduces friction.

The reason our tires look different from those outfitted to race cars, is because we drive for different reasons. Race car drivers require a smooth tread on their tires because it provides more grip during dry conditions. If dry conditions are not present, then they may switch to tires with treads.

Since the rest of us do not use our vehicles for racing, we frequently drive through adverse conditions, like rain, snow and mud. Since water accumulates on the road during these wet conditions, our tires need treads for better traction in these harsh conditions that we so often drive through.

The grooves that you see on your tires work to siphon water away from the tires when the roadway is wet. This can help to reduce the risk of hydroplaning when traveling at higher speeds on a wet road or highway. If the treads on the tire are not at the proper depth, it can become difficult for enough water to be carried out from beneath the tire, thus increasing the possibility that you could lose control in such conditions.

A is the right answer.

I supposed that these threads ensure coefficient of friction hence friction force.

Why crests so wide in SUV's, or other heavy vehicle?

Can anyone elaborate this answer?

As per my opinion (a) is the right answer.

But they very narrow, and only posses for f1 cars, to certain speed and distance, and they are changed, but they do not recycle, I mean for addition of rubber layer on outer surface of it, they completely recycle.

So why F1 racing tyres have no tread? Though they also runs in wet condition, what is the arrangement done to these?