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Having worked for sears tire america I can say they are temperature sensitive and "spoil" so to speak like food does. The brown color isnt a good color and is usually followed by cracking and separation. The black color is actually painted on the tire and protects it.
Lastly tires are made up of parts and you can break a band, belt, etc inside on a pot hole and get a vibration or see a pimple on the tread as well as sidewall area.
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