Tires WHY do tires go FLAT every winter?

/ WHY do tires go FLAT every winter? #21  
<font color="red"> Are they flat on only the bottom or the top and bottom? If it is only the bottom, then just turn them over. </font>

<font color="blue"> Is that what they mean by "tire rotation"? </font>

Speaking of tire rotation, I saw I sign at Walmart advertising tire rotation for $1.50 per tire. I walked up to the desk and told the girl I wanted one tire rotated.

Right over her head! /forums/images/graemlins/shocked.gif /forums/images/graemlins/tongue.gif /forums/images/graemlins/grin.gif
 

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