Originally Posted By: Quattro Pete
Isn't there another dot (yellow or green) that gets put on some of the tires? What does that one signify?
Once we exclude the red dot from the discussion - which isn't very universal - this starts to get even fuzzier.
If there are identifiable dots on the tires, they tend to be radial high point marks. If there are 2 dots on a tire, the red one tends to be the high point, and the other one the balance. But this second dot is so far away from being used consistently, it's almost not worth talking about.
Nevertheless, if you find a dot on a tire, match it up with the valve hole (or the dot on the rim, if there is one). No harm is done if you do, and it just might be better.
But