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Inspecting for cracked bottom bracket shell

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Inspecting for cracked bottom bracket shell

Old 12-11-20, 04:11 PM
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mrv 
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Inspecting for cracked bottom bracket shell

Pic below- 30 year old RockHopper
Bottom bracket shell
Question- can a crack form in the weld?
Theres some corrosion that almost looks like a failure start. Looking inside the shell, I canít see any cracks.

Why am I asking- Iím chasing an increasingly loud creeking sound.
- cleaned the drive train.
- replaced the chain
​​​​​​- cleaned the BB threads and greased the threads and tightened.
- shifting is fine.
- replaced the pulleys but havenít ridden that change yet.
- probably Iíll try another wheelset to see if itís the hub - but the noise is only present when pedaling, and thatís kind of intermittent.

Anyway, I broke a 30 year old RockHopper in March- it cracked around the BB shell A friend gifted me this Frameset. So Iím predisposed to think I broke another the same way.

any suggestions are appreciated.



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Old 12-11-20, 05:54 PM
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guy153
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It looks all right to me. Does the creak go away if you ride standing up out of the saddle? The saddle itself can be a source of loud creaking in time with the pedals that makes you think it's something with the BB etc.
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Old 12-11-20, 06:09 PM
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Originally Posted by guy153 View Post
It looks all right to me. Does the creak go away if you ride standing up out of the saddle? The saddle itself can be a source of loud creaking in time with the pedals that makes you think it's something with the BB etc.
Hi - once the noise stars clicking and creaking I can stand up and it stays. I've had a creaking seat rail before, so I know what you mean.
I'm hoping it's the hub, which I'll try tomorrow, if it's not too rainy.

But riding along, like applying a bit of torque into a head wind, it sure sounds like the BB is clicking and creaking.
Thanks!

..... or i'm hoping it's cracked so i can order up a new XOXO........ https://www.kickstarter.com/projects...s-xoxo-bicycle
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Old 12-11-20, 06:33 PM
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unterhausen
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that looks uncracked to me. Unless there is some major malpractice in the weld, cracks start on the side of the seat tube.

I would certainly inspect that frame thoroughly for cracks, particularly the head tube.

But once you have lost faith in a bike, that's more than reason enough to retire it.
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Old 12-11-20, 10:31 PM
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Creaks are far more often a component thing and not a frame source. I'm with Eric on the images not showing what I would expect to see if there was a crack in the weld. I suggest a thorough servicing bod the bike including things like seat post/seat clamp and ring bolts. Andy
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Old 12-12-20, 06:46 AM
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Originally Posted by Andrew R Stewart View Post
I suggest a thorough servicing bod the bike including things like seat post/seat clamp and ring bolts. Andy
Good reminder!
Iíll look at the chain ring bolts when I swap wheels to confirm the rear hub is not full of grit.
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Old 12-15-20, 12:07 PM
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Try the rear wheel skewer as well. I had that issue on an older aluminum MTB -- I even sanded paint off some areas of the frame checking for cracks. Turned out to be the rear wheel skewer not being quite tight enough.
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Old 12-15-20, 09:21 PM
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Originally Posted by David Tollefson View Post
Try the rear wheel skewer as well. I had that issue on an older aluminum MTB -- I even sanded paint off some areas of the frame checking for cracks. Turned out to be the rear wheel skewer not being quite tight enough.
I don't think it was the skewer - I had the wheel on/off several times working on the bike and cleaning it.

- I think the problem might be in the freewheel cassette body. I need to do a bit more diagnosis.
I changed a bunch of things at once, and the noise stopped: put a NEW cassette a different wheel; changed derailleur pulleys
So not sure which of those changes fixed it - but now I got no good reason to buy a new frameset. nuts.
Probably I'll stick the old wheel back on with the new cassette before I spend the $90 replacing the cassette body. Velocity - Hubs, Parts, Cassette Bodies

cheers!
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