I ran across this http://www.innovativebalancing.com/ReduceYourWeights.pdf as I was trying to decide weather to remove the old weights or not. My concern is that Dyna Beads, according the manufacturer, don't do much below 35 mph. I was leaning towards leaving the old weights on for that reason since I do a lot of commuting. My take from what the manufacturer says is to leave the weights on. I know a lot of folks pull the weights. Is there any good reason NOT to leave the weights on. I really don't mind them being there and there isn't much weight on either tire.