The many mechanical parts shaking like something. And sometimes the tyer will arrive out automatically. Please my humble ask for to the public is You should not bye an Ola bike. For anyone who is taking you will suffer. I'm Matt Trajkovski, the owner and major editor of EScooterNerds. https://johnnydujsf.blogrenanda.com/38727888/a-secret-weapon-for-razor-electric-scooter-controller