Always have a spare! These Vee 20 x 1.3/8 Inch tubes are a Schrader valve type (think car valve) and are suitable mostly for alloy rims as carbon rims in the 451mm size are nearly always drilled for a French valve.
Vee 20 X 1.3/8 Inch Tube (Schrader Valve)
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View AllVee 20 X 1.3/8 Inch Tube (Schrader Valve) / Black / 1-3/8 Inch