Amazon.com : 2-Pack 12.5" Bike Tubes 12*½x1.75x2*¼ (12.5x2.25) AV32mm Schrader Valve Bicycle Tire Tubes Compatible with Most 12.5x1.75 12.5x1.95 12.5 x 2.10 12.5 x 2.125 12.5 x 2.25 12-½ x 2-¼ Bike
57-203)12 1 / 2x2 1/4 inner tube is suitable for electric scooters, electric bicycles, folding bicycles and children's bicycles - AliExpress