[Y-Blockhead]

Originally Posted by MikeK

One very slight problem with the above calculations- The measured diameter of a tire is not equivalent to the rolling diameter. Even for tires of the same size, this will vary between manufacturers, construction, and tread.

And of course Mike is correct. These calculations are all on paper and the results will be different in real life.

I just wish I could get that fact into the heads of engineers where I worked (now retired). They kept coming up with these "new ideas" (and I'm sure still do) to make a better product or save money that don't work in real life.