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Old 05-28-18, 02:27 PM
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Originally Posted by UniChris View Post
That would depend on how loose it is to begin with.

Anyway, to my understanding, the problem is that spokes that become untensioned enough at the bottom of the wheel that they move relative to their shape when tensioned, are susceptible to fatigue cracking.

Thinks like forming the bend probably help, but short of something like a straight pull spoke I doubt you can get it formed perfectly enough that there is no movement at all as the tension changes.
What you're describing isn't a bicycle wheel - it is a bunch of spokes attached to a rim. If you want to talk about how something works, you can't start with the assumption that it is wrong or broken and then extrapolate from there.

Spokes fatigue from variations in spoke tension within their normal tension range. If the elbows aren't seated properly the fatigue load gets concentrated there and the elbows break. If there are too few spokes the tension they carry increases as does the amplitude of tension they see as the wheel rolls, wearing the spokes faster.

In a properly spec'd and built wheel, the spokes will never break from fatigue. The rim will fail first, followed by the aluminum flanges. Wheels that break spokes have something essential wrong with them in either design or execution, because steel spokes are much more fatigue resistant that the aluminum rim and hub.
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