# Physics

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I have to compare and contrast three types of tires, and relate them to physics.

I've chosen:
<li> Racing tires
<li> Winter tires
<li> All season tires

I've chosen to compare them on:
<li> Rubber compound
<li> ???

As you can see, I need something else to compare. I thought of air pressure but that's not really determined by the type of tire...any ideas?

Thanks.

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