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Old 05-03-08, 01:38 PM
  #22  
dwood
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Join Date: Oct 2007
Location: Atascadero, California
Posts: 160

Bikes: Specialized Hardrock Sport [1998], Dahon Speed P8 2007, 1994 Diamond Back Ascent and a couple of Schwinn Stingrays [one boys, one girls] from circa 1977.

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Originally Posted by SweetLou
That is also not stress relieving. You are setting the spoke line That is different than taking a spoke beyond its yield point so that it plastically deforms.

You are correct that a normally tightened spoke doesn't reach its yield limit, but parts of the elbow are at its yield point due to the bending during manufacturing. This is what you are trying to get rid of. If the elbow is not stress relieved, it will remain at its yield point, reducing fatigue life. Once this residual stress is removed, then a tensioned spoke is not at its yield point. This is why a properly stress relieved spoke that is tensioned adequately will last a very long time, longer than the rim will last.

Absolutely wrong! When it was bent during manufacture the area of the bend 'did' exceed its yield point, allowing it to remain bent. But it doesn't 'stay' at its yield point just because it is bent. In fact, depending on the alloy, its yield point has now been raised in the area of the bend due to work hardening. No amount of dickin' around with squeezing, pushing, pulling on that spoke is going to stress relieve the metal in that spoke.
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