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Old 11-06-2011, 01:22 PM
sixto's Avatar
smoke gets in your eyes
 
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how to test rolling resistance

With so many eyes on fuel economy, how come they don't publish rolling resistance specs for tires? I assume it can be measured if they talk about it as a design characteristic.

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87 300D

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Old 11-06-2011, 01:40 PM
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Quote:
Originally Posted by sixto View Post
With so many eyes on fuel economy, how come they don't publish rolling resistance specs for tires? I assume it can be measured if they talk about it as a design characteristic.

Sixto
87 300D
Too many variables...road temp, road surface, ambient temp, weight of driver, model of vehicle, etc.

Not publishing the findings also removes liability if the findings don't match with real world numbers.
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Old 11-06-2011, 01:43 PM
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smoke gets in your eyes
 
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Yes but they have normalized wear ratings. Seems like a reasonable request rather than regulating the use of descriptors like eco and green.

Sixto
87 300D
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Old 11-06-2011, 06:22 PM
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IIRC, one of the car test mags, years ago, published a graph with each road test. They plotted acceleration and coast from speed curves.

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