BPMs (balance point modulation) are weights that can be installed on the 3 influence zones of your scooter ( deck / fork / bar ), to modify its balance.
Two types of weight are available for each zone, allowing you to adjust the behavior of your scooter according to your riding style and tastes.
The addition of BPM allows for a scooter with more stability and control, while keeping it lightweight.
By varying the weight distribution between front and rear, it is also possible to modulate the type of deck rotation.