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Old 09-14-2015, 05:46 AM   #13 (permalink)
Focus-Ak
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Join Date: Sep 2014
Location: Alaska
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n/a - '05 Ford Focus ZX3
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[ The chart below has been corrected. The two green dots were in the wrong place; both should have been for a tire profile of 60. Related text below (for 16" rims is also corrected. ]

I got curious about the data in Lambillotte's slide #30 (in a powerpoint found through Barry's web page on tires). Here is a parameterized chart of the data for the 28 tires, with tire width as a parameter, and colors indicating rim diameter. The chart gives rolling force vs. tire profile.

Some of the data points for the 14" rims seem questionable from this view of the data (i.e., it is odd that the 185 curve is flat and the 195 curve has a negative slope -- both in comparison to the others.) Also, the two 16" rim data (green dots) are anomalies, since these are the only tires with a profile of 60. This low profile seems to have made up for the efficiency loss that the high width of these tires would cause.

Nonetheless, I think this analysis provides a handle on the complicated relationships involved, which the slideshow chases around but seems to miss. (See URL embedded in the chart.)



My apology for the poor legibility of the tire width labels -- I had to downsize for the size limits of EcoModder photo albums.

Last edited by Focus-Ak; 09-18-2015 at 05:23 AM..
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