Scooter Tube & Valve removal, Flat Tire, Repair (Trotineta Cyberbot SpeedXman, 8.1/2 x 2-156 A)
8.1/2 = 8.5
Diameter: 8.5 inch (outer diameter of tire, 21.6 cm)
Width: 2-156 (156 mm = tube's inner diameter)
Check the interior of the tire so it won't puncture your new tube!