What causes valve tear off?
A valve can be torn off if it has been installed under tension. Another frequent cause is installing a Sclaverand valve tube into a rim with a larger valve hole. The metal edge of the valve hole can shear the valve stem off the tube. Caution: Be aware that there are also rims that have the correct valve hole of 6.5 mm on the outside, but a larger hole of 8.5 mm on the inside, which causes the problem. A nut that is excessively tightened just exacerbates the problem of tear off. The major role of the rim nut is to lock the valve in place at the time of inflation. Torn off valves are often seen on mountain bikes. Continual improvement in brake performance and low inflation pressures often cause the tire to slip on the rim. The tire movement then drags the tube and this can lead to the valve shearing off. What can be done to prevent tire slip or valve tear off? A higher inflation pressure considerably reduces the tire moving. Of course a higher tire pressure is not always desired. We impl
