12-Inch Inner Tube – For 12x1.75 to 12x2.125 Tires – Bent Valve

List of compatible tire sizes

These 12-inch bike tubes are designed for tires ranging from 1.75" to 2.125" in width.

If the tire size printed on your sidewall appears in the list below, you can order these tubes with confidence.

• 12x1.75 (47-203)
• 12x1.75 (44-203)
• 12x1.85 (47-203)
• 12x1.90 (47-203)
• 12x1.95 (54-203)
• 12x2.00 (50-203)
• 12x2.10 (54-203)
• 12x2.125 (57-203)

If your tire size is not listed above, these tubes will not fit your bike. Check out our other 12-inch tube options.

Use Cases

This 2-pack of 12-inch inner tubes is designed for the small everyday vehicles kids use most. They're a perfect fit for children’s bikes and balance bikes, as well as tricycles and grow-with-me models. They can also fit certain leisure and outdoor gear that uses 12" wheels—such as bike trailers or jogging/all-terrain strollers, depending on the model.

Compatible with all standard pneumatic tires, whether tubetype or tubeless-ready used with an inner tube.

Materials & Performance

Made from premium butyl rubber, these 12-inch inner tubes offer:

• Excellent air retention for longer-lasting pressure
• Enhanced resistance to punctures, pinch flats, and everyday wear
• Smooth, comfortable riding—ideal for kids on pavement or packed paths
• Easy, hassle-free installation, even for at-home repairs

Get your child’s bike rolling again in just minutes after a flat. With this 2-pack of 12-inch tubes, you always have a reliable spare on hand for family rides, daily commutes, and outdoor adventures—wherever you go.