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Interesting, and thanks. I'm obviously not thinking about it in the right way.
I was thinking that with approximately 50% of the teeth are engaged, and that
is constant as the cranks go around - as the ring picks chain at a faster
rate, it leaves at the same, faster rate off the ring. None of that seems off
to me, barring the assumption that approximately 50% doesn't really vary
significantly. I doubt it does, but wouldn't bet on it. Perhaps the main
factor is the change in triangulation, or whatever the proper term is, that
results in the difference in length of unengaged chain from sprocket to ring.
There's a good chance I'm on my own here in either wanting to understand this,
or being slow at understanding it.
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