Über Fahrradschläuche: Unterschied zwischen den Versionen

* Ein hohler Schlauch, der auf das Gewinde der Ventilkappe (wie ein Schrader Adapter) aufgeschraubt wird. Die Rändelschraube des Ventils muss komplett aufgeschraubt werden, damit sich das Ventil während der Fahrt durch Vibrationen nicht selbständig schließt. Da das Ventil nur durch den Luftdruck verschlossen bleibt, besteht die Gefahr des Luft Entweichens insbesondere bei Reifen mit niedrigem Luftdruck. Um die Nuss herunterzudrücken muss ein Stück Papier oder Speichenende in den Schlauch geschoben werden.

* A hollow tube which screws onto the valve-cap thread like a Schrader adapter. The knurled nut of the valve must be tightended in its open position so it can't vibrate closed during riding. Only air pressure then seals the valve, risking leakage, more so with low-pressure tires. A spoke, straightened paper clip or the like must be inserted into the extender to depress the nut.

* A tube which also attaches to the valve-cap threads, but with a rod which engages the knurled nut and extends out past the end of the tube, so the nut can be turned to open and close the valve.

* An extender with its own valve core at the exposed end. The extender is installed in place of the original valve core, and so can be used only on an inner tube with a removable valve core.

Unless an extender has its own valve core, a pressure reading is possible only with a pump which has a built-in pressure gauge. Like a Presta to Schrader adapter, an extender which screws onto the valve-cap threads must have a rubber o-ring seal, or it must be sealed with silicone caulking compound or the like, else it will leak during pumping.