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Rim shot?

Old 06-24-11, 05:47 PM
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Rim shot?

Hey everyone,
I picked up a set of wheels with XT Hubs from a friend (Cheap) the rear is fine, but the front was a bit out of true (quite a bit actually)

Stopped by my favorite LBS who trued the wheel for me, but after 1 block, the wheel was out of true again (front brake shudders badly) he has tried to true it 4 times, eventually he said the rim is shot and there isn't anything he can do with it

Is it possible to have a RIM that is toast but look fine?
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Old 06-24-11, 06:33 PM
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Yes, but unless the eyelets are letting go it shouldn't go out of true so fast. Unless this is a low spooke count wheel I suspect that something else is going on, possibly one or more stripped nipples, that seem to tighten then slip under load.

It's also possible that the shop rat isn't good at what he does, and might be putting lots of twist into the spokes (very common with thin spokes) which then untwist as you first start riding undoing his work.

Lastly look for any hint of stress cracking on the sides of the rim, sometimes invisible but can detected as wider areas when the tire is inflated to high pressure. One hint is if it shudders less at lower pressure than high,the flanges are probably near the end. If the rim is modern enough to have a brake track wear indicator (either a grove or small dimples) see it you've passed the limit.

Those are possibilities, but without seeing it it's impossible to be definitive. In your shoes, I'd consider seeing another mechanic for a second opinion. Be straight and let him know it's been aligned and gone out quickly.
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Old 06-24-11, 06:35 PM
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If the wheel won't stay straight, I'd loosen all the spokes and see if the rim truly is straight. It could be that it was warped due to a crash or deliberate vandalism. It's possible that a skilled mechanic could straighten a bent rim, but any bike shop will want to replace the rims and spokes. Straightening a rim might still leave residual tension imbalances in the wheel, and it'll never be as reliable as a wheel built with a new rim.
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Old 06-24-11, 06:37 PM
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oh man, I thought I was gonna hear a funny joke.
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Old 06-24-11, 06:47 PM
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Originally Posted by garage sale GT
oh man, I thought I was gonna hear a funny joke.
Ba-da-boom!
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Old 06-24-11, 06:49 PM
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It doesn't LOOK worn, and the spoke Nipples all "feel" ok to my fingers (None are twisting loosely) The shop I took it to is one i do trust and highly recommend and they have fixed broken spokes for me before with no problem, but maybe I should take it to a shop that specializes in wheels... (A friend of mine knows a place that allegedly is a master wheel builder)
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Old 06-24-11, 08:00 PM
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I see you're in Jersey City. If you're willing to drive a bit, bring it to Alan at Westwood Cycle, tell him I sent you.

Let him take a look at it and try to re-align it. He'll either do it right or tell you what's wrong.

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Old 06-24-11, 10:00 PM
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Originally Posted by mcgyver74
Rim shot?
Rim shot.
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Old 06-26-11, 12:28 PM
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Thanks FB, I'll check it out.

In the meantime I put my good (albeit heavier) Forte rims back on so I can ride for now.... Need to see if it's worth fixing the others
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