gerblefranklin said:*I think that the amount that tire pressure can change the
circuymfrance of the wheel is negligable, unless you have huge rollup
distances. I think that the inevitable turns you make while rolling
back have a greater effect on the distance/rotation ratio. I do notice
that hand rolling the wheel doesn't work as well, though. *
Perhaps I didn't explain what I meant very well. My point was that when
you apply your body weight to your unicycle (as in riding it) the tyre
will naturally compress somewhat. Depending on how much you weigh and
what your tyre pressure is the amount of tyre sag will vary. Even though
the percentage change in the circumference will be pretty small as you
say, over a number of wheel rotations it will be enough to put your
rolling hop out of alignment. This is why hand rolling the wheel back
doesn't work as well.
For convenience I omitted the body weight factor in my earlier post,
assuming that most riders will not gain or lose any mass when doing a
rolling hop. Though its effect can readily be seen by having a
substantially heavier rider borrow a lighter rider's unicycle and seeing
the tyre sag.
+{}|\|>-
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