How to remove Presta Valve Core (Instructions in 4K)
In this video we explain how to remove the core of a Presta valve.
The valve core does not come out completely. It can only be pushed back into the inside of the tire/tube.
After removing the tube from the rim, we use pliers to remove the nut from the top of the valve core. Now make sure the core is still completely straight. Otherwise it may be difficult to push the valve core into the tube and also to get it back out later on.