> The PowerTap used a special hum that had a strain guage in it to measure
> torque.

Now that would be an exceedingly clever trick :-)

I assume that the hum measured the force with which the chain tension
pulled the axle forwards.
If so that would be chain force rather than torque per se, with torque
inferred from chain centre to axle radius.

It's not instantly obvious to me
how you'd measure pure torque in a hub. No doubt enough thinking would
suggest a way.



     Russell
--=20
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