I don't know if everyone expressing their opinion really knows first hand but when I had beads in mine I was told by the supplier to remove existing tape weights and put in two ounces in front tires with four ounces in rear tire. Why would a person say leave on old weights doesn't understand that leaving them defeats the purpose of doing this. If you do leave the weights, it only seems to me you have to make up the difference by adding more to fix a different problem.