I balanced the rim first. Then I mounted the tire and balance again to find the heavy spot. Then I will move the heavy spot on the tire to the lightest spot on the rim, this way, I can minimize the use of lead weight. No, the heaviest spot is not where the valve stem is and the lightest spot of a tire is not necessary where the yellow spot indicated either.


By the way, I only installed one bead onto the rim to find the heavy spot, in case I had to turn the tire around. Otherwise, it would be impossible to rotate the tire in the rim.


Every time I replaced the tires, I also replaces the valve stems.