Commonly 26" , 27.5" (650b) , or 29" diameters. Widths range from 1.75" to 2.4" or more. 2. Identify the Valve Type
REI , Decathlon , and Dick's Sporting Goods stock higher-quality tubes and more specific sizes.
Inner tubes are flexible and fit a range of widths, but the diameter must be exact.
Contains a liquid sealant inside that automatically plugs small holes from thorns or glass.
Wide and flat, like a car tire valve. Common on mountain, hybrid, and kids' bikes.
You can buy bike inner tubes at local bike shops, major big-box retailers, or specialized online cycling stores. Quick Buying Options
Usually 700c diameter. You’ll need to match the width, commonly 23mm to 28mm .