Its strange there has been a spike in cost of tires and tubes. All tubes are brand name from Vee Rubber, Kenda and Fly plus King Tubes and several others no generic chinese
Most scooters use tubeless tires and rims. When you valve stem breaks or your tire has a small leak adding a tube will surley get you buy especially if your tire is still in shape.
I have added the tube size and the tire/rim size.
Bassically a 10 inch rim or tire get the 10 and so on yup to 16