Like tyres, tubes, range in size depending on the tyre being used. For every tyre there is a corresponding tube. Modern tubes have two different styles of valves used for inflation, Presta or French. The valve which allows for the highest tyre pressure (100psi+) is French valves, typically used on road bikes and high end mountain bikes. Schrader valves are used on larger, wider tyres which do not require high pressure (80psi or less).
If you have any specific questions about bike tubes or would simply like to hear more about the importance of bike tubes, please feel free to contact us.