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Warped Rim, Salvagable?

Old 04-14-08, 12:50 AM
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fixedvincefixed
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Warped Rim, Salvagable?

I have a severely, yet incredibly clean bend in my double walled back wheel. It makes a perfect sinusoidal wave when spun on a stand; it's that clean a warp. So I've heard that you can pound that out. Is it true, or do I need to get a whole new wheel?
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Old 04-14-08, 01:35 AM
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You sure it's not just a good truing session you need? Or did you taco it? I can't see how it could get "damaged" in a way that results in a wobble that takes place over a whole turn or most of a turn of the wheel. That's more about just going out of true.
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Old 04-14-08, 03:25 AM
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Once a rim is actually bent, any attempt to straighten it out is a salvaging mission on a part who's strength is permanently compromised.

That said, I've had pretty good luck just removing the wheel from the bike, pumping the tire to the max pressure, grabbing at one apex of the bend, and slamming the other apex into the ground/floor to bring it back to somewhat true again. Check the seam to make sure it isn't badly twisted or broken. If you use rim brakes, use emery cloth on it if it's slightly uneven. Then fine tune it with a spoke wrench. I've seen some wheels last for years after doing this. Some not.

If you're going for a new rim, remember that a wheel with evenly tensioned spokes is as strong a wheel as you can get. Make sure the builder knows how to use a tensionmeter. Might save you from tacoing another one.
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Old 04-15-08, 04:03 PM
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Thanks for your help guys, but it's tacoed. A dude kicked it when I left it downtown. Jerks. Anyhow, I'm just gonna get a new one.
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Old 04-15-08, 04:15 PM
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It it makes a perfect sine curve it's probably saveable. That's what happens with something puts a side load on the rim enough to cause it to go over center. The rim's probably not actually bent.

Loosen every spoke until you see exactly 1 thread showing. That might be enough to make it spring back on its own. If it doesn't nudge it back by propping the wheel in a corner or something like that. Retension and retrue and you're good-to-go.
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Old 04-15-08, 04:52 PM
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If it tacoed from someone kicking it you can true it but the spoke tension will be all over the map. Get a new rim or wheel.

But a taco is pretty severe where the rim folds over. It sounds like you case may just be some badly stretched spokes. It's actully pretty hard to deform a rim from something like that.

If you loosen up the spokes it'll tell you a lot in a hurry.
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