A tire could have for example, be zero statically balanced, but could have like several ounces of residual dynamic imbalance with the 2 points 180 degrees apart. Although the tire wouldn't hop, it would shimmy like crazy. The only way to truly understand it is to balance about 8000 tires by yourself, like I have in the last 16 years. You can also have a dynamically balanced tire with residual static imbalance too, causing a hop, with no shimmy. A hop happens once per revolution, and a shimmy is usually twice per revolution of the tire/wheel. As to the OP's original question, yes they definitely need to be dynamically balanced with tape weights.