What is the purpose of the blue and red lines on new tires?

[SamanthaLynn]

New tires have blue and red lines to prove that the tire is indeed brand new and unused. Here is additional information: Tire lifespan: There are wear limit indicators in the tread of the tire. According to current regulations in China, when the tread depth of a passenger car tire is less than or equal to 1.6 mm, it means the tire has reached the end of its life. However, it is generally recommended to replace the tire when the tread depth is less than or equal to 2 mm, taking into account the tire's drainage performance. Purpose of the colors: The color indicates the width of the tread and the specifications of the tire. The lines are made of ordinary paint, which fuses with the rubber after being vulcanized in the vulcanization workshop. Every new tire has these lines. They serve as a mark to distinguish between new and old tires, as well as to identify retreaded tires.