The tires air pressure in no way decreases it’s circumference. The notion that because the diameter is less when a tire is low the circumference lessens is …hogwash! Example: If one were to measure the diameter (distance form the ground to the top of the track) of the military’s main battle tank, …

They probably average over several minutes, long enough for those variations to even out. But if you drive in a circle for that long, I guess it would fool them! Maybe that’s another reason the government required the in-wheel sensors, instead.

Well, I don’t know all the technical reasons that are involved in a low tire, but the circumference of a low tire is definatly smaller than a fully inflated one. And I have TPM on my van and I believe they monitor the pressure.

B.L.E. wrote: What keeps these inflation monitors from reporting a false low tire when you are taking a long radius turn on a highway? This is just a wild guess, but both outside tires would be turning faster than the inside tires in this case, so that information could be used to realize that’s w…

And here are the answers to all your questions- http://www.nhtsa.gov/cars/rules/rulings/tirepresfinal/tireprmonsys.html

This has nothing to do with the question at hand, but I am almost sure that i have this kind of TPM B. Direct TPMSs Direct TPMSs use pressure sensors, located in each wheel, to directly measure the pressure in each tire. These sensors broadcast pressure data via a wireless radio frequency transmit…

Steel does stretch, including guitar strings, but not as much as the wood moves. It is partly that ability that gives steel its tensile strenth. But in a tire we’re taling about steel that’s constantly being flexed back & forth, constantly works, and also is subjected to various stresses including …

@PhillipNeuman - It is not the diameter of the tire that matters, it’s the circumference. A flat tire that has gone from 12" radius to 10" radius does not roll 20% faster. The circumference of the tire has decreased by a very slight amount as the pressure reduction results in a slight reduction in…

Low Tire = Smaller Circumference.......?

The Show

PhillipNeuman January 26, 2012, 8:29pm 20

The radius of the wheel between the axle and the ground determines the rotational speed.of the wheel. When the tire pressure is low the radius is shortened.

What the rest of the tire is doing that is not in contact with the ground is immaterial.

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Low Tire = Smaller Circumference.......?

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