What are the Red/Yellow Dots on a sidewall for?
A red dot applied to the sidewall of a new radial medium commercial truck tire indicates the high point of radial run out, and must be considered for optimal match mounting of the assembly. For steel wheels, align the red dot with the dimple. For the aluminum wheels align the red dot with the valve stem. Some new tires have only yellow dots and they should be mounted with the yellow dot aligned to the valve stem, on both steel and alluminum wheels. Always ignore the yellow dots on new tires that have both red and yellow dots. Red dots always over-ride yellow dots.
