Amazon.com : Fnina CST 16 In Kids Bike Inner Tubes 16 x 1.51.75 Bike Tube 32mm Schrader Valve (1-Pack) Explosion Proof Inner Tire Tube Compatible with 16x1.51.75 fit Most Kid Bike Quality
Carlisle GR/KR 16 Radial or Bias Passenger Inner Tube For 16 Inch Wheels Has TR13 Valve Stem - Kartek Off-Road
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Two 16 Inch Front Farm Tire Tractor Tubes fits 5.50-16, 6.00-16 TR15 V
16 Inch Inner Tube 16x2.125 Bent American Type Valve Bicycle Inner Tube 32mm - Walmart.com