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Rusted hole in fork

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Rusted hole in fork

Old 12-07-09, 03:11 PM
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RHRM
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Rusted hole in fork

Hi,

When I started to take apart my bike and cleaning it I found that one of the small holes in the rear fork had rusted and now after I scraped of the rust it was 1 1/2 mm wider and 2 mm longer so my question is how serious this is



Here is a quick illustration to show what I mean
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Old 12-07-09, 04:01 PM
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Grim. That's a vent hole for gases during brazing (at least, that's my understanding), so it was originally supposed to be there. Is it okay that it's more of a hole now? I don't know. The fact that you have that much rust visible would make me concerned that there's more inside the tube which you can't see. In other words, if you knew absolutely that you had removed all of the rust, it might be okay. I might ride it while I looked for a new frame, but I don't weigh much.
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Old 12-07-09, 04:03 PM
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I asses it as very serious. The only way the hole could have gotten larger is if the metal around it rusted completely through and that does not bode well for the rest of the tube that you can't see. . By "rear fork" I assume you mean either a chainstay or seatstay has the now larger hole. If one of them breaks, you are in for a really major accident.
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Old 12-07-09, 04:17 PM
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as you can see i removed alot of paint around the hole to see if there was any more hiding under the paint but it looks clean
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Old 12-07-09, 06:23 PM
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It's like a picture out of Nasa wow.
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Old 12-08-09, 01:54 PM
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Use some touch up paint and go ahead and ride it. The seat stay doesn't have to be that strong.
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Old 12-08-09, 02:21 PM
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The pitting looks pretty deep. Also the fact that the hole has "rusted" bigger indicates that there's some serious issues going on here. I'd be worried about the wall thickness almost anywhere along that tube being reduced to where it may collapse. The rust around this blow hole may be just the tip of the iceberg or it may be stricktly a locallized spot.

If it was mine I'd likely test the tube and the rest by rapping them with a piece of wood looking for any soft spots that would indicate internal rust that has thinned a wall enough to allow a localized collapse. If that occured then the frame is definetly toast.

Some of the other folks may have some other ways of testing for the same sort of thing. Hopefully they'll pipe up with suggestions. But either way this sort of damage isn't something I would just ignore if it was one of my frames.
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Old 12-08-09, 07:44 PM
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Originally Posted by davidad View Post
Use some touch up paint and go ahead and ride it. The seat stay doesn't have to be that strong.
I dunno. I don't think I'd want to be bombing down a 30+ mph hill when a seat or chainstay broke.

I'm still concerned the damage around the hole is, as BCRider put it, "the tip of the iceberg". If it were my frame, I'd play taps and give it a funeral with full honors.
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