Valve stem removal is the process of detaching the valve stem from the tire and wheel assembly. The valve stem is a small, cylindrical component that allows air to be added or removed from the tire. It is important to remove the valve stem before mounting or demounting a tire, as this will prevent damage to the valve stem or the tire.
There are a few different ways to remove a valve stem. The most common method is to use a valve stem remover, which is a small tool that is specifically designed for this purpose. Valve stem removers are available at most auto parts stores. To use a valve stem remover, simply insert the tool into the valve stem and twist it counterclockwise. The valve stem will then be loosened and can be pulled out by hand.