More on why trailer tires fail more than tow vehicle tires

RV Tire Safety with RV tire expert Roger Marble On a thread on an RV trailer forum Peter made this statement: “At highway speeds interply shear is not as much of an issue, as I understand things.” I posted this reply: Speed itself is not the issue that causes interply shear in radial tires. Two things happen to radials when…

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Why do trailer tires fail more often than tow vehicle tires?

RV Tire Safety with RV tire expert Roger Marble Here is a question posted on a travel trailer forum: “Why so many trailer tire failures and so few, if any, tow vehicle tire failures?” This post could be considered Part 2 of my post of last week, How do you figure an ST-type tire’s maximum safe speed? The primary reason,…

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How do you figure an ST-type tire’s maximum safe speed?

RV Tire Safety with RV tire expert Roger Marble Originally posted on an online forum: “The 65 mph is not really correct. It depends on load and air pressure. They can go to 80 mph.” As I have pointed out previously: The load formula that populates the Load/Inflation table, used by the tire industry for ST-type tires, is based on the assumption…

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Pros(?) and cons of dual tire air balance systems

RV Tire Safety with RV tire expert Roger Marble I read a thread on an RV forum about connecting two tires in dual position, with hoses to “balance” the inflation pressure. There were some claims made about performance improvements, but IMO the conditions necessary to deliver those improvements are pretty extreme and improvements are tenuous. The information on the function…

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OK to support just one dual tire on leveling block?

RV Tire Safety with RV tire expert Roger Marble Question: “I have some questions about leveling with ramps, specifically on vehicles with rear duallies. The obvious temptation is to use only one ramp – and the obvious response is that this is a 2x overload condition and should be avoided. However, since tires and wheels are clearly designed with safety…

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Is using state scales for “four corner weights” wise?

RV Tire Safety with RV tire expert Roger Marble I was following a forum thread on using closed state scales to learn your “four corner weights.” This is possible in Washington, Oregon, and some other states.  Some commenters felt the practice was not wise as the area around the platform scale might not be perfectly flat. I posted my thoughts…

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Is it worth it to inflate tires with nitrogen?

RV Tire Safety with RV tire expert Roger Marble Regarding nitrogen (N2) passing through (permeating) tire rubber more slowly than oxygen (O2) due to molecular size, are nitrogen molecules really larger than oxygen molecules? According to the Get Nitrogen Institute in their paper on N2 effusion, “The correct answer, with respect to ‘permeation,’ is yes.” So I imagine your question is: Why…

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Did your RV company/dealer follow federal law regarding tires?

RV Tire Safety with RV tire expert Roger Marble I’ve been reading a number of posts recently on recalls, violations of federal safety standards in the RV industry and on tire and fire extinguisher recalls. If you have been a reader of my blog, you know that I am a strong proponent of filing complaints on failures of safety-related systems and…

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