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#1
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Beat rim into true or not?
After a recent crash I have discovered a permanent bend in my front
rim, more of a single wave that extends about 1/4 of the way around the rim. Laying the rim on the floor after disassembling the wheel, the max out of true is ~1/4". There doesn't seem to be a kink in it,but rather a smooth wave. Would you beat on the rim with a rubber mallet or just bring it into true with the spokes? Oh, yeah, rim is Open Pro 36 spoke. TIA App |
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#2
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Beat rim into true or not?
App wrote:
After a recent crash I have discovered a permanent bend in my front rim, more of a single wave that extends about 1/4 of the way around the rim. Laying the rim on the floor after disassembling the wheel, the max out of true is ~1/4". There doesn't seem to be a kink in it,but rather a smooth wave. How wobbly was the wheel before disassembly? How uneven was the spoke tension? If the spoke tension was very uneven, throw that rim away and rebuild the wheel. Why did you disassemble the wheel? Do you mean you unlaced it, or loosened the nipples, or what? You can straighten rims by hitting them with a mallet while the bent section is between two 2x4s. Whether you'll have a round, straight wheel with safe spoke tension is another issue. Might be time for a new rim, especially since the one you bent is so lightweight. -Vee |
#3
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Beat rim into true or not?
search to: 'DIY rim repair tool 2' in tech archives
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#4
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Beat rim into true or not?
On 15 Jul 2005 09:03:07 -0700, "App" wrote:
After a recent crash I have discovered a permanent bend in my front rim, more of a single wave that extends about 1/4 of the way around the rim. Laying the rim on the floor after disassembling the wheel, the max out of true is ~1/4". There doesn't seem to be a kink in it,but rather a smooth wave. Would you beat on the rim with a rubber mallet or just bring it into true with the spokes? Oh, yeah, rim is Open Pro 36 spoke. There is little to be lost by trying to straighten it, but much to be gained by doing so carefully and well. It's all a matter of value, though; is an hour or two of your time spent in trying to get it flattened worth more than the cost of the replacement rim? If the answer is "yes", then just buy a new rim and either discard the bent one or hang on to it for one of those odd moments when you really have nothing else to do. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
#5
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Beat rim into true or not?
"App" writes:
After a recent crash I have discovered a permanent bend in my front rim, more of a single wave that extends about 1/4 of the way around the rim. Laying the rim on the floor after disassembling the wheel, the max out of true is ~1/4". There doesn't seem to be a kink in it,but rather a smooth wave. If the rim isn't flat - if it rises 1/4" above the table on one side - then that's not really a problem. An Open Pro aluminum rim 1/4" out of true can easily be pulled straight by the spokes (especially if its a 32 or 36 spoke wheel), because it's a light aluminum rim and the spokes control the rim (the same cannot be said for a heavy rim or a steel rim.) I think that many rims start out their life (before truing) with this much bend in them. It could be that your rim came from the factory with this problem. If the rim has a problem on one side and not another, then i'd be much more concerned, that is quite unusual, and I would probably purchase another rim. - Don Gillies San Diego, CA |
#6
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Beat rim into true or not?
App wrote:
After a recent crash I have discovered a permanent bend in my front rim, more of a single wave that extends about 1/4 of the way around the rim. Laying the rim on the floor after disassembling the wheel, the max out of true is ~1/4". There doesn't seem to be a kink in it,but rather a smooth wave. Would you beat on the rim with a rubber mallet or just bring it into true with the spokes? Oh, yeah, rim is Open Pro 36 spoke. Given the amount of hassle involved in trying to get it straight, I'd buy a new rim - especially as this is a current production model so you can get a match. I had a slightly bent Open 4CD which built into a wheel which was straight, but predictably had uneven spoke tension. I saved the spokes and put a cheap MA3 on there instead (MA3 and Open 4CD are virtually the same ERD), and all is well. |
#7
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Beat rim into true or not?
Don wrote:
I think that many rims start out their life (before truing) with this much bend in them. It could be that your rim came from the factory with this problem. If the rim has a problem on one side and not another, then i'd be much more concerned, that is quite unusual, and I would probably purchase another rim. Rim was perfectly true prior to build; crash rendered it bent. What do you mean "on one side and not another"? Do you mean that the rim has been compressed laterally (box section is squished)? 'Cuz that isn't the case. The rim simply is out of true in a semi-sinusoidal fashion with only one phase. Maybe 1/2 phase?, anyway, the rest of the rim is true and the "bent" section is out to one side ~1/4" at it's greatest excursion. Anyway, based on the info/opinion in the responses, I am going to rebuild it (coupla bent spokes when I de-tensioned the wheel so I fully disassembled it and threw out the bent ones) without wanking on it. I'll post results of that rebuild including spoke tension in that region by spoke. Thanks for all your input. App |
#8
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Beat rim into true or not?
The sometimes undeniable Zog wrote:
especially as this is a current production model so you can get a match. Sadly, no. It is the RED open pro. Available only as NOS. So I'll give it a whirl - don't think it'll be too bad - flattening the bent section by leaning on the rim on the floor took only small amount of pressure. I could get a black or silver replacement, but, hey, aesthetics DO matter. I am going to try - 1.5 hours to very possibly save myself the effort of finding another NOS red OP rim. Plus, I just built the damn things. Worth it, I think. App |
#9
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Beat rim into true or not?
On 15 Jul 2005 09:03:07 -0700, "App" wrote:
After a recent crash I have discovered a permanent bend in my front rim, more of a single wave that extends about 1/4 of the way around the rim. Laying the rim on the floor after disassembling the wheel, the max out of true is ~1/4". There doesn't seem to be a kink in it,but rather a smooth wave. Would you beat on the rim with a rubber mallet or just bring it into true with the spokes? Oh, yeah, rim is Open Pro 36 spoke. I recently had a rim that was bent worse than that, courtesy of being in a cargo trailer with a bunch of other bikes during a serious accident. For what it's worth it's an Alex DA16, 700c, 36 spoke. It never occurred to me to try to beat it with a rubber mallet. Instead I removed the rim from the wheel, first taping the spokes together at their outer crosses. I laid the rim on a carpeted surface, concave side down, with the out-of-round spot resting on one leg of my work stand. I jumped up and down on the two high spots (one foot on each spot), then checked for flatness on my coffee table. A few iterations of the above and the rim was pretty flat again. I relaced it, tensioned and trued, and am still using that wheel. In fact I'm planning on climbing Going-to-the-Sun Road in Glacier National Park on that bike next week. ;-) jeverett3ATearthlinkDOTnet http://home.earthlink.net/~jeverett3 |
#10
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Beat rim into true or not?
App Wrote: The sometimes undeniable Zog wrote: especially as this is a current production model so you can get a match. Sadly, no. It is the RED open pro. Available only as NOS. So I'll give it a whirl - don't think it'll be too bad - flattening the bent section by leaning on the rim on the floor took only small amount of pressure. I could get a black or silver replacement, but, hey, aesthetics DO matter. I am going to try - 1.5 hours to very possibly save myself the effort of finding another NOS red OP rim. Plus, I just built the dam things. Worth it, I think. App I broke a mallet trying this once, the steel Schwinn rim barel returned back toward round so I gave up and bought another wheel. I still have the wheel, and it could still be ridden at slow speed, bu even if straightened would leave me wondering about the strength of th wheel if I was at speed -- meb |
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