Bicycle Inner Tube Valve Stem

A spring loaded removable core inside the valve stem keeps air from escaping when the depressible pin is not lowered.

Bicycle inner tube valve stem. The inner tube has a valve used to keep it pumped up. Unlike a schrader the system doesn t use a check valve it seals entirely based on pressure in the tube or tire. A lock nut to secure the stem at the wheel rim and a valve cap may also be present. Most inner tubes have either a presta or schrader valve which we ll come on.

The valve stem opens by unscrewing a knurled textured nut at the top. Some bike inner tubes have schrader valves like those used on car tyres. A plastic cap comes with each inner tube to protect the valve from road debris and water. Rather than replacing the tire or having a tire or bike shop make this repair do it yourself in only a few minutes with an inexpensive tool that can be bought at most automotive stores.

The depressible part of the valve a small pin sits inside the valve stem. In this video i am showing how to easily patch inner tube near the valve. Schrader valves are more common on mountain comfort hybrid and child bike inner tubes. Valve stems are used on most tires from bicycles to large trucks to allow the tire to be inflated quickly and properly.

It s the inner tube sitting inside the tyre that holds the air. Most problems with a valve stem on a bicycle or truck tire tires with schrader valves can be used on both can be attributed to a faulty valve stem core. It comprises an outer valve stem and an inner valve body. Likewise if your wheel has a valve hole the right diameter for a.

Is it possible to patch a hole at the base of the valve or any hole of the tube.