I had the dealer install these counteract balancing Beads in my two tires. The reason was that I felt a vibration and especially a type of fluttering around corners. Because the wheels are small, the dealer does not balance them. They are difficult to balance and require a special had tool.
When I picked up the Vespa and rode home, I could not believe the difference! After riding it to Saranac lake with my wife on the back, I really noticed the difference. I had to continually check my speed to make certain is was acceptable because the Vespa was gliding over the roads at speeds in excess of 65 Miles per hour.
Many bikers ask about these and I can tell you from experience that they work! Additionally, they will increase your thread life.