What Do the Red and Yellow Dots on Tires Mean?

[DeDelilah]

Tires The solid red dot on a tire indicates the position of maximum longitudinal vibration, meaning this is the heaviest spot, or in technical terms, the center of gravity. During rotation, tires generate vibration, and this spot is where the vibration is most pronounced. Conversely, the hollow yellow dot represents the position of minimum longitudinal vibration, indicating the lightest spot on the tire. Here are some precautions for tire installation: Valve stem alignment with the heaviest point: A car's wheel consists of three parts: the tire, the rim, and the valve stem. The valve stem is first installed on the rim and should align with the rim's heaviest point. Yellow mark alignment with the heaviest point: When assembling the tire, the position marked with a yellow dot on the tire should correspond to the rim's heaviest point to achieve better dynamic balance.