Originally Posted by ShocknAwe
You can actually damage the compound permanently by running them in temps that are too low.
For summer tires, it is not advised to use them below 50 degrees. Some of the more temperamental (sticky) tires will be damaged permanently (I would say in the freezing/near freezing area). They will never perform the same after this happens.
Please give us your source for this informaiton. I would be interested in the physics behind this. I Live in Albuqueruqe NM and as it rarely snows here I have used summer tires in several winters. The last set I used were Conti DW. I now have Micheline PS2's. I have never had any problem with any of them from the cold.