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Help - Do you know how to remove this bottom bracket?

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Help - Do you know how to remove this bottom bracket?

Old 07-18-20, 07:42 PM
  #1  
Ericblake
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Help - Do you know how to remove this bottom bracket?

Hello! Iím rebuilding an old beach cruiser with my son and we ran into this bottom bracket that I have not been able to remove.

The box nut is 34mm wide and recessed making it all but impossible to get a wrench around. I ordered a 34-36mm C hook spanner but that turned out to be too small and prob just not the right tool. Then I ordered a super thin adjustable plumbing wrench that was wide enough but I could not get a good grip due to the nut being recessed.

Now the only thing I can imagine will turn is a 34mm double sided (recessed) wrench which is a huge tool and expensive.

Am I totally backwards on this? I welcome your input! Thank you!
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Old 07-19-20, 06:08 AM
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Iron Horse
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Can you post a picture of the bottom bracket?
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Old 07-19-20, 01:28 PM
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Ericblake
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Sadly, I haven't made 10 posts yet so cannot post pics.
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Old 07-19-20, 04:12 PM
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Iron Horse
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Go into introductions and say "welcome" to a bunch of random new posts. 10 posts, done. Then post a close-up of the crank. We'll see if we can't come up with something to help.
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Old 07-20-20, 09:49 AM
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The Old Peddler
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When you can post a photo, the answer should be available from someone. I have had to deal with a few of those awkward bottom bracket assemblies myself.

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Old 07-31-20, 04:21 PM
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Ericblake
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Ok. Sorry for the long delay! Please see pics below for this bottom bracket that I cannot remove. I just got a huge 34 mm spanner wrench in the mail that still didn't fit - just spun around it. Kind of at my wits end at this point. Please let me know if you have any advice for me! Thank you!

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Old 07-31-20, 06:14 PM
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What you are looking at is the left side bearing cone. There should have been a keyed washer and lock nut on top of what you see. Did you remove these already? The threads on this side are left-handed meaning that to remove, you need to turn them clockwise. Bearing cones should not be cranked down tight and so should easily unscrew. The last couple I did unscrewed with just finger pressure. If yours is rusted or crudded up it may take a bit more effort. Squirt some penetrant onto the threads and wait a few hours, then grip the flats with a pair of pliers (or whatever else comes to mind) and turn clockwise. If that still doesn't work, I'd probably tap on the flats with a chisel and hammer (again clockwise!) until it breaks loose. You'll probably replace the bottom bracket anyway so hammer away. Just don't damage the threads on the crank.

Good luck.
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Old 08-01-20, 11:27 AM
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Thank you! Yes, I already removed the washer and lock nut. Based on what you said, I'm sure the bearing cone is rusted in place and YES, I was trying to unscrew it counter clockwise. I'll take your advice and report back. Thank you again!
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