THE COMMON TUBELESS VALVE STEM
With the recent uptake of tubeless tire/rim combinations now gaining increasing favor over traditional rubber / butyl / latex inner tubes across the general cycling population (Professional road cyclists still currently prefer glued-on tubular tires for various reasons), the humble tubeless valve stem has become a necessity.
But as with most things in life – Not all tubeless valve stems are created equal!
The vast majority of commonly available valve stems are manufactured from thin wall, welded or extruded aluminum tubing which is then thread cut both internally to accept the industry standard Presta valve core and externally for the rim locking nut.
Brass valve stems also exist but are generally significantly heavier when compared to the same length in alloy.
Most alloy stems undergo various types of colour anodising which provide some degree of corrosion resistance and improved aesthetic appearance.
With many stems the rubber, usually V-shaped, inner rim seal is either bonded or pressed on to the alloy shaft and cannot be replaced.