Tire noise

penguin

Why do tires make noise as an automobile passes?

p3skyking

The sound from the tires bounces back at you.. Think low tech sonar.

fideau

You need to turn your deflector shields on. [8D]

woodhog

Special 'sound bars' are cast into the side of tires, to let you know your going tooo slow

84Bravo1

The tires on my Jeep Wrangler, are probably the most aggressive, you could imagine. I believe CAD design has done wonders for their design. They are virtually silent.

In the old school, they would have been humming big time.

Ricci Wright

What are you, three years old??

iceracerx

Actually, the tires make 'noise' when rotating. Even when not passing you. Sort of like a tree falling in the forest.

Grasshopper

Would you here a frozen penguin fall off a tree in the middle of a the woods? inquiring minds.

wpageabc

Vibrations... Where the rubber meets the road.

penguin

Well I guess the above do not have an explanation as to what causes tire noise. I did not think it would be necessary to make my inquiry clearer but from the responses I guess I was wrong. Lets await judgement and see if we get a well thought out scientific answer. .

mogley98

Tire pattern noise, it occurs because air is trapped in the tread pattern and is suddenly released as the tire rolls along the road surface.

Also the treads hitting the road can create a a thumping sound.

Tread design is a science in itself.

NeoBlackdog

http://www.tirereview.com/the-fight-against-tire-noise/
Google is your friend.

p3skyking

[:p] I gave you the answer to the question you asked.
When a car passes you, it being made of steel, the sound waves eminating from your tires, strike it and bounce back.

More simplification: Your tires are always making noise. You just don't hear it. Not just cars will bounce the noise back. Drive close to a bridge tall guardrail. You will hear your tires from that too.

If you know anything about dolphins and bats terrain avoidance sonar, you will understand sound bounces back off solid objects.
Radar works similar, but with much higher frequencies.

Smitty500mag

The main reason that causes tire noise is the air chamber inside the tire. The large void that is filled with air acts as a giant resonance chamber.

Grasshopper

another simple answer,,friction,
When two penguins rub together it's friction.