Quote:
Originally Posted by Diesel_Dave
Has anyone ever seen any data for tire rolling resistance vs temperature? I've searched around and so far haven't been able to find anything.
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Hi Diesel_Dave,
See here.
The EPA temperature adjustment for tire rolling resistance:
Quote:
The constant term fO is assumed to represent the tire rolling resistance and should be corrected for the difference between the test ambient temperature and the standard ambient temperature. The correction may be expressed
fO* = fo[1 + Ko(T-68 F)] (14)
where Ko may be assumed to be 3.3 x 10-3/ F, or may be based on empirical data for the particular vehicle drive train and tire test, if this information is available.
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So tire RR decreases about 22% at 0 compared to 68 degrees F. Which is going the wrong direction. The largest contributor to RR in modern tires is the stiffness in the steel belts, and that is almost unchanged for the range of temps that a tire sees. The change in the flexibility of the rubber at low temps is likely unimportant. In fact, as the rubber gets stiffer it flexes less so it should roll easier. I'd look at the viscosity of bearing and gear greases as the main culprit.
-mort