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Discolor tire shows you when it's time for new rubber

Two designers that have already won a Red Dot concept design award for the Bevel Cup, Gao Fenglin & Zhou Buyi, have come together again on an idea called the Discolor Tyre. Understanding it couldn't be simpler: A layer of colored rubber beneath the black casing will appear when the outer tread depth falls beneath a certain amount. Fenglin and Buyi estimate that 20,000 kilometers of driving, or about 12,400 m