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How to transfigure the Wikipedia
Would you like Wikipedia to always look as professional and up-to-date? We have created a browser extension. It will enhance any encyclopedic page you visit with the magic of the WIKI 2 technology.
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What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.
This graph image could be re-created using vector graphics as an SVG file. This has several advantages; see Commons:Media for cleanup for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with {{vector version available|new image name}}.
It is recommended to name the SVG file “Rolling resistance vs inflation -- NHTSA The Pneumatic Tire.svg”—then the template Vector version available (or Vva) does not need the new image name parameter.
Summary
DescriptionRolling resistance vs inflation -- NHTSA The Pneumatic Tire.png
The force necessary to overcome en:hysteretic losses in a rolling tire is known as en:rolling resistance. This parameter became important to USA vehicle manufacturers with implementation of C.A.F.E. (Corporate Average Fuel Economy) standards for new cars. It is measured by placing load cells in the wheel spindle and measuring the rolling resistance force in the horizontal (longitudinal) direction. It requires precise instrumentation, calibration, speed control and equipment alignment for repeatable results. Rolling resistance is usually expressed as a coefficient: resistance force per 1000 units of load. OE passenger car tires designed for fuel efficiency may have coefficients in the range 0.007 to 0.010 when fully inflated and evaluates at thermal equilibrium. The test load, speed and inflation pressure vary according to the vehicle manufacturers’ requirements. Rolling resistance is significantly influenced by inflation pressure, as illustrated in the figure. Since tire rolling resistance can consume up to 25% of the energy required to drive at highway speeds, it is economically wise to keep tires inflated properly.