Quote:
Originally Posted by stj_1533
Joe,
Thanks, those pix make it very clear. I had in mind spring-loading it on an arm, kind of like a bike derailleur, rather than mounted right on the frame. I think we'd be okay if there's not a lot of play to begin with, otherwise the slack being taken up during acceleration might give inaccurate readings.
- Steve
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Bike chain derailleur's work as they do for the sole reason that the chain is only ever driven (intentionally) in one direction.
When you put a spring loaded tensioner on one side of a drive chain that goes both directions, in one direction you shouldn't have torque startup issues, but in the other the initial start may be enough to pull the tensioner and loosen the chain adding quite a bit of slack.
And more slack = higher chance of popping off
Also the main reason bike derailleur's are spring loaded is the gear changing system, fixed drive bikes simply slide the back wheel forward and back to tension the chain and no spring is involved.