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, …

red rolfe, yes you must have sensors in the wheel, which are more costly when the car is made, but a more accurate direct measure.

“Not correct. The pressure is stretching the tire and the cords it’s made of. Ever tune a guitar? You’re stretching wires as you do it.” Steel probably does not stretch enough to matter at the stresses of a normal tire pressure. When you tune a guitar, you are probably distorting the wood more tha…

BLE - not true, that’s how inflation monitors that depend on wheel speed work. And when you tune your guitar, the change in pitch results directly from stretching the wire. The flexing of the wood works against this, not for it. As I said, there’s about 6000-8000 pounds of tension on the tire belt…

What keeps these inflation monitors from reporting a false low tire when you are taking a long radius turn on a highway? When a string breaks on a guitar, the sudden release of that string’s tension makes the rest of the strings go sharp, so the wood does flex. Also, when restringing a guitar, by …

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.

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…

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.

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

The Show

EllyEllis January 16, 2012, 8:40pm 16

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.

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

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