RussellMc wrote:
> Conclusion: Best of following meanderings seems to be a sprocket in
> the top chain run which deflects the usually straight chain run
> somewhat and which can move verticlly wrt chain. Sprocket loads a load
> cell which allows chain tension to be measured from frame.

Problems with this are that the chain moves laterally when gears are
shifted, and that the speed/force ratio changes as different back gears are
selected.  You need to know what gear you are in (at least in the back) to
do the math.

These are solvable problems, but add to complexity, weight, and finnikiness=
..
Tune's solution forces you to use their back wheel, but was accepted well
enough by serious and professional cyclists.


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