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This is a design for the bicycle air valve, there is a layer of thick rubber in the air around, can be exposed from the hole in the tire rims, in different pressure conditions, the rubber can show different colors.
Users will be more easily understood the tire pressure.
Zhengzhou University of Light Industry
Zhengzhou, China
Gangyang Peng,
Zhengzhou University of Light Industry
Feng Gu,
Zhengzhou University of Light Industry
Weiqianzi Wu,
Zhengzhou University of Light Industry