How did I get it originally? You can get the tyre width and height (in meters) from RAF output. It's easy enough to convert the heights into profile percentages, since usually only one value will give an integer result for the rim diameter (inches).
I've found the relevant byte offsets in the RAF output (using the description of the file format on the LFS website) but I can't convert the 4-byte hex codes into decimal. I assume they're IEEE single-precision floating point numbers but the conversion doesn't seem to work.
For example, the FOX has wheel widths 66 66 66 3E and 85 EB 91 3E but when I convert those to decimal I get 2.72x10^23 and -2.22x10^-35.
The converter I'm using is this one: http://www.h-schmidt.net/FloatApplet/IEEE754.html
Any ideas?
BTW, I don't doubt your numbers, Bob, I just like to know how this stuff works for myself