YunSCM 2PCS 20" Heavy Duty Bike Inner Tubes 20x1.50/1.90 ETRTO 40/47-406 AV32mm Valve 20 inch Bicycle Tubes Compatible with 20x1.50 20x1.60 20x1.70 20x1.75 20x1.85 20x1.9 Bike Tire Tubes