Light area on tires???
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What you are seeing is the white rubber that is embedded in the sidewall for the white letters. The white strip goes all the way aroung the tire but only shows as white where they grind the black away on the letters but it still shows up lighter than where there isn't any white rubber below. If you look at some white lettered tires that are scraped against curbs regurlarly they will end up looking like whitewalls after the black gets scraped away.
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