Because it's hard to know when you're going to get a flat, it's always good to have extra tubes on hand. Specialized's Standard Tube is lightweight and reliable.
Schrader valves are identical to those found on car tires. These valves are generally used on hybrid and children's bikes. Presta valves, which are found on most road and off-road bikes, are longer and thinner and feature a threaded tip, which must be opened to inflate (turn counterclockwise).
|700 x 20-28c||719676001203||030-0303|
|700 x 20c-28c (48mm valve stem)||719676242576||030-01305||762818|
|700 x 20c-28c (60mm valve stem)||719676340661||030-01306|
|700 x 28-38c||719676107530||030-0306|
|650 x 20c-28c (48mm valve stem)||719676215945||030-01302||030-01302|
|26-inch x 1.0-1.15||719676001388||031-0320|
|26-inch x 1.25-1.5||719676001395||031-0321|
|26-inch x 1.5-2.2||719676001401||031-0323|
|26-inch x 2.4-3.0 (add $1.00)||719676265698||0302-1000|
|24-inch x 1 1/8-1 3/8||719676216003||031-01335|
|24-inch x 2.4-3.0 (add $1.00)||719676265704||0302-1010|
|20-inch x 1 1/8-1 3/8||719676171968||031-1346|
|20-inch x 1.0-1.5||719676357553||031-0348|