ENVE creates simple Pressure Relief Valve Stem Nuts that promise a low-cost solution to protect expensive carbon wheels from high-pressure tubeless damage.
Did you ever imagine that there was a real risk, when you pumped up your road tubeless setup to your tire’s max PSI, that you could delaminate your carbon rim? Well, ENVE explains how an imperfect tubeless setup can actually pressurize the internal cavity of your rim, exposing it to high internal pressures that rims, especially lightweight carbon rims, were never designed to handle.
And not just their wheels, they’ll work on any brand rims. Because the problem isn’t specific to their rims. Actually, it’s not a problem with any brands’ rims per se, it’s all about the set up.The general thinking behind ENVE’s Pressure Relief Valve Nut is that any failure in the tubeless setup of your rim can allow air pressure to build up in the inner chamber of the rim.
Our first thought would be that if there isn’t a good seal with the tire-to-tape or the valve-to-rim, your tubeless setup wouldn’t hold air anyway. I’ve experienced this more than once.But since many carbon rims have an especially tight connection between nipple & rim, and often no other opening in the rim , if pressure escapes from the tire through the rim bed, it can become trapped inside the rim.
So when you expose a lightweight rim to high internal pressures that it wasn’t designed to handle, you open up the possibility of delaminating the carbon structure of the rim. In extreme cases, you can separate the rim sidewall from the tire bed or even create internal damage not visible from the outside while still weakening the rim.Looking to solve the problem, Enve developed a safer tubeless valve and locknut that ditches the O-ring & airtight seal we are used to.
The product is a simple $5 fluted alloy valve nut. ENVE recommends it for all of their top-end SES carbon tubeless wheelsets, and it can protect pretty much any lightweight road tubeless wheelset from any other manufacturer, too. It’s hard to argue with spending ten bucks to safeguard your multi-thousand dollar wheelset.
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