hello, can someone tell me if that is ok or what that is.. have a benzou roller throttled to 25 km/h.. have now changed the electronic part that he now runs 40.. only now from 35 km/h the scooter makes animal crack… it starts to vibrate quite lukewarm then something, so that if you drive in the car behind the wheel the disks shake… what can that be exactly? many people can tell me the kenamd.. thanks.. gruss michael