Reply To: change tyre ? by Home › Forums › General Scooter Chat › change tyre ? › Reply To: change tyre ? September 11, 2016 at 2:30 pm #16696 manidonParticipant 12 inch inner tire (bead) diameter. 4 inch wide. But this is kinda an old way of measuring tires and nowadays only used for small scooter tires.