![]() ![]() all contribute to rubber degradation, and even when not exposed to elements or use, rubber degrades over time anyway. Exposure to ozone, UV, chemistry in the exhaust, heat from the brakes. The earliest bad ones, without any stainless steel braid protection, saw failures from impacts, as well as the same limited lifespan that the rubber tires themselves have. The bad ones also include those that are heavy, such as the thick braided stainless steel type, which can not only contribute to rotational balance concerns, but can also whip around more from their own mass. The bad ones include those that are pressurized, such that when they get severed from a road hazard, the inside dual looses all air. I've owned a dually of some sort for the last quarter century, and have not run inside dually valve extenders because of all the problems in actual usage that many are already well aware of, and proof of that awareness is confirmed by the search for " a set of good ones." Especially when it comes to safety, and especially where the rubber meets the road. In fact, the modulus of elasticity of the unique material can tolerate severe manual bending, but left alone, the material is stiff enough (and light enough, reducing the influence of its own mass) to be used without any stabilizer brackets or wires.Īnyone who knows me knows that I just don't put any 'ol thing on my truck that I read about, see advertised, or find on sale. Yet flexible enough to resolve any angular difference between the projection angle of the factory valve stem on the inside dual rim, and the inner axial perimeter of the hand hole opening on the outside dually rim. Quite stiff, for less susceptibility to centrifugal whipping. I found a set of good ones, from Germany.
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