The 24 x 1 3/8 (540) inner tube size is compatible with certain types of racing bikes and city bikes. The inner tube has both Schrader and Presta valves available, with valve lengths of 38mm and 48mm. The color of the inner tube is typically black.
The 24 1 3/8 tire size is a relatively uncommon size, and it is important to ensure that the inner tube is the correct size for the tire before purchasing. Using an incorrectly sized inner tube can cause problems with fit and inflation, and can also increase the risk of punctures or other damage to the tire and inner tube.