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My spokes is brokes

Old 03-05-16, 02:49 PM
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My spokes is brokes

I've been breaking spokes on the rear wheel. I decided to see if the wheel was worth re-spoking or just new wheel. So what I've tried to test is to see if the rim is even straight. So I loosened all the spokes to the point where the nipple is showing the first thread. I then spun the wheel around in my truing stand and there is a noticeable wobble, at least a half inch play, from side to side. Did I just confirm that the rim is bent or is it possible that a new rim with the spokes set to this depth with introduce a wobble????

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Old 03-05-16, 03:11 PM
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Guess so , only way to be sure is take it out and lay the rim on a Flat surface ..

How many times have you had to re true your wheel since it was Newly Built,

with a rim Known to be Flat, Panar, and round circular?
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Old 03-05-16, 03:49 PM
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Is the tension completely gone, all the spokes are loose? How tight a wobble does the rim have? Is it over about 1/2 the rim's circumference or only over a hand full of spokes? How nice a job and future chance of no further problems do you want? Is there a mix of newer and older spokes currently in the wheel? Any well worn nipples? Andy.
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Old 03-05-16, 04:14 PM
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When you loosened the spokes did they all seem to be about the same or did you have to unscrew some much more than others?
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Old 03-05-16, 04:32 PM
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I wouldn't put much faith in your test of trueness by loosening the spokes. Since some spokes had broken previously and were replaced, are you even sure that all the spokes on each side are exactly the same length? If the wobble you observe is over a substantial part of the wheel circumference as opposed to a sharp deviation at one point then it's likely that rebuilding with fresh and matched spokes will give you a good wheel.
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Old 03-05-16, 04:39 PM
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Take a perfectly flat disc and mount it on a shaft that isn't square to the face. When you spin it, it'll wobble. By the same token, a wobbly wheel provides no information on whether the rim is round and flat or not.

The is positioned and held in place, flat and square to the axle by the spokes, and that' what truing a wheel is all about.
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Old 03-05-16, 08:22 PM
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All you have managed to show by loosening the spokes like that is that you can 'build' a really loose wheel which is massively out of true.

Am I missing something, or is there no real reason not to completely take it apart and lay the rim on a relatively flat reference surface? You would be respoking anyway, no? the time saving of keeping the wheel together and swapping in new spokes in the place of old, is minor. If it turns out that the rim is badly bent or crooked, you need to take the whole thing apart anyway.
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Old 03-05-16, 08:51 PM
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How many spokes have been broken? When it gets around 6 or 8 , that's generally a good indication that you need a new wheel.
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Old 03-05-16, 08:57 PM
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If you loosen all the spokes until they are LOOSE.

Then lay a new, or otherwise flat rim against your rim, you should be able to determine if your rim has a lateral bend. It will be more difficult to determine if it has a hop.
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Old 03-05-16, 11:32 PM
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Some of us here has the experience to best read the loosened spokes rim for it's likely natural condition. But the Op is unlikely to be one of these people. So advise to compare to fixed/known objects (true and round wheels) is good advice. As well as the attempts to better understand the degree of wobble. Andy.
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Old 03-06-16, 12:45 AM
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Once the spokes are loosened, a wobble would be expected. Like expecting a wheel to be perfectly true as one builds it, it doesn't happen.

So, at this point, one might as well truly loosen all the spokes so they are actually slack. Then check to see if the rim lies flat. The problem is that unless one really loosens the spokes to the point where they will fall out, the hub will get in the way.

Thus, my suggestion to use a second NEW rim as a standard against the old rim, kind of like using a table with a hole cut out of the middle.

If the new rim fits flat against the old rim, the the old rim is reasonably flat. One might be able to tape them together or something and carefully inspect the bead for a deflection indicative of a hop.

Back to breaking spokes. There is the popcorn theory of spokes. Once one breaks a couple of spokes, it is indicative that they are all close to their fatigue life, and one should consider replacing 100% of the spokes. In which case, you could just disassemble the wheel anyway.

I've ridden for years on bent rims with a permanent hop that I've pulled back as straight as I could get them with some overtight spokes and some slack spokes, and don't think it actually caused excessive spoke breakage. I just considered my wolber rims to be my wobbler rims
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