Metal valve extensions should never be used with the TR600HP and TR801HP series snap-in valves as the centrifugal force that is generated at high speeds by the added weight of the metal extension can break or crack the stem, causing it to unseat and result in a loss of air. However, you should use the stem specified for the thickness at the wheel’s stem hole. The wheel can be thicker if the coined area around the hole meets the required specifications. 205 inches, a metal clamp-in valve stem must be used. In any case where the rim thickness at the stem hole is greater than. This same tolerance applies with the TR602HP, TR801HP and TR802HP valve series. 156 inches, while the TR600HP high-pressure valve stem series is limited to use on wheels with a stem hole thickness no greater than. The lower pressure TR413 valve stem should never be used on wheels with stem hole thickness greater than. 453-inch diameter stem holes, and the TR801HP and TR802HP stems are specified for. The TR600HP and TR602HP valve stems are specified for. Another good alternative is the use of a clamp-in metal valve stem rated at 200 psi (13.8 bars). These valve stems are rated at 100 psi (6.9 bars) maximum. This can usually be corrected by installing a TR600HP or TR801HP high-pressure snap-in valve stem instead. This can cause the valve stem to crack, blow out of the rim hole, or become unseated. One of the most likely problems you may encounter with the TR413 and TR415 series valve stems at any inflation pressure above 65 psi is the vale stem running at a higher than normal temperature as a result of hot weather or other similar condition. Be aware that many old catalogs still in circulation rate the TR413 and TR415 series valve stems at 60 psi maximum. Today, they are rated at a maximum of 65 psi (4.5 bars). The TR413 and TR415 series valve stems were originally designed to handle inflation pressures up to 60 psi (4.1 bars). In some cases, the stem hole in the wheels for these tires is the same size as the valve stem hole in a passenger vehicle wheel. But because of their load carrying capacity, some tires are still produced in sizes we formerly considered as commercial light truck tires. Because of their ply ratings and steel construction, many of these tires are now categorized as medium or even heavy-duty truck and bus tires. Most of the complaints involve light duty trucks with TR413 or TR415 series snap-in valve stems on heavy ply-rated tires that call for inflation pressures as high as 95 psi (6.6 bars). One major problem we found is that these individuals were using the wrong valve stems. In the last few months, calls have come into the International Tire & Rubber Association (ITRA) from commercial light truck owners complaining of a sudden loss of air in their tires, sometimes at high speeds. Over the years, very few problems have been associated with today’s tubeless valve stems, and the tremendous popularity of tubeless tires today is a testament to their success and that of the valve stems they require.Īt the same time, increased inflation pressures and higher speed limits make selection of the proper valve stem extremely important. Today, that assumption could lead to severe problems. When tubeless tires first entered the commercial tire market years ago, technicians assumed that if the tubeless valve stem fit the hole in the wheel it was the right valve stem.
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