Bicycle Tubes

The valve nut is used to affix the valve in the wheel rim and keeps the valve in position during pumping. But it is not completely necessary. If you use a valve nut, only tighten this slightly by hand. Do not user pliers or a similar tool because this might damage the tube.

Aero wheels in particular often have very high rim profiles, which means that 42 mm valves are often insufficient. In addition to a valve extension, Continental also offers special tubes with a 60mm or 80mm valve shaft.

We cannot recommend one specific valve. It is important however to ensure that you choose a valve that matches the rim borehole to prevent e.g. valve tears. Three valve systems have established themselves: the classic bicycle valve (Dunlop), the car-valve (Schrader) and the Presta valve (Sclaverand). The narrow Presta valve is particularly well suited for racing bikes.

If a valve nut is used, turn this back and slight press to open the valve (applies to Presta valves). Check the valve for apparent damage. It may be that the pump is faulty. Ensure that the valve is at the 12 o'clock Position.

Continental valve cores can always be unscrewed and replaced.

Tire movement may cause slanted valves which can be prevented in the first instance by a higher air pressure. Therefore check the operating pressure and the seating of the tires at regular intervals. Tires may slip along the wheel rim during braking, especially on mountain bikes. If using disk brakes, tire movement is less prevalent because the brakes and wheel rims have no direct contact. Tire movement on tubeless tires has no Impact.