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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 01-06-09, 04:42 PM   #1
HandsomeRyan
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How I removed a stuck bottom bracket...

The drive side piece of this BB was so stuck in the frame that it broke my pin spanner when I tried to remove it. The BB is garbage once it's out of the frame anyway so to remove it I welded a piece of scrap steel to the cup and used the biggest pliers I own to twist it free. You can see how much torque it took based on the twist in the welded piece. Once I got it started it screwed right out; I'll check the threads and grease liberally before installing the new BB.

Please excuse my booger welds, they held to twist the piece out and that's all that matters.

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Old 01-06-09, 06:01 PM   #2
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Slightly surprised your welds held up, but that would have been easy to fix.
Lacking a welder, I would have drilled out the holes for the pins a bit bigger
and tried a BFH and punch or maybe a bit of metal with corresponding holes
and tried self tapping screws into the holes through the metal and wrenched
on that.
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Old 01-06-09, 06:13 PM   #3
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Glad it worked out. Here's what I would recommend next time. Scroll down to the section "fixed cup tools." Sheldon's homeade bb cup removal tool works on even the most stubborn cups, along with soaking with penetrating oil and maybe a little impact and a lot of leverage.

http://www.sheldonbrown.com/tooltips/bbcups.html
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Old 01-06-09, 06:16 PM   #4
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Was this the fixed (drive side) cup or the adjustable (non-drive side) cup? It certainly looke like an adjustable (nds) cup, given the pin holes, lack of wrench flats and lack of an outer flange to limit it's thread depth.
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Old 01-06-09, 06:19 PM   #5
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I think the apparent lack of flange is just a product of the photo. I've seen fixed cups designed for pin spanner installation and removal.
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Old 01-06-09, 06:32 PM   #6
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Use Anti-sieze when you assemble !!! Smoother torqueing, and it will make disassembly possible later.
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Old 01-06-09, 06:39 PM   #7
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Originally Posted by I_bRAD View Post
I think the apparent lack of flange is just a product of the photo. I've seen fixed cups designed for pin spanner installation and removal.
Some of the nicer cup and cone bottom brackets used two adjustable cups so you could fine tune your chainline. Well I take that back, since one of them was left threaded, they had adjustable fixed cups, how does that sound?
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Old 01-06-09, 07:58 PM   #8
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Assuming that it would clear your chain stay, or could be bent to do so, you could have welded it in parallel to the chain stay and then used the piece of steel as a lever. I'm also surprised those welds held. Either way, congrats on getting it out, and remember to at least grease the new one.
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Old 01-06-09, 08:43 PM   #9
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Torch applied to the bb area will get 99.999999999999999999% of the bb's out there. Of course the caveat is you don't give a flying **** about the paint. Best case would be minor discoulouration of the bb area.
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Old 01-06-09, 08:48 PM   #10
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Originally Posted by JustCruisin View Post
Use Anti-sieze when you assemble !!! Smoother torqueing, and it will make disassembly possible later.
+1

Anti-seize, or even plumber's teflon tape, is your friend, esp when you know the BB will have to be replaced sooner or later.
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Old 01-06-09, 08:50 PM   #11
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Torch applied to the bb area will get 99.999999999999999999% of the bb's out there. Of course the caveat is you don't give a flying **** about the paint. Best case would be minor discoulouration of the bb area.
Just don't set the rubber mat on fire like I did.
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Old 01-06-09, 10:39 PM   #12
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One of my proudest moments. Same kind of bottom bracket that was absolutely not coming out. So I took a hacksaw and cut the cup in half. Then made another cut to make it look like a piece of pie (3 total cuts). Tapped the "piece of pie" out and then tapped out the rest. I then considered myself a genius for a couple days.
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Old 01-07-09, 05:42 AM   #13
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Originally Posted by sch View Post
Slightly surprised your welds held up
They don't look pretty but they held tight!.

Quote:
Originally Posted by well biked View Post
Glad it worked out. Here's what I would recommend next time. Scroll down to the section "fixed cup tools." Sheldon's homeade bb cup removal tool works on even the most stubborn cups, along with soaking with penetrating oil and maybe a little impact and a lot of leverage.

http://www.sheldonbrown.com/tooltips/bbcups.html
I should have known that Sheldon would have a solution...

Quote:
Originally Posted by HillRider View Post
Was this the fixed (drive side) cup or the adjustable (non-drive side) cup? It certainly looke like an adjustable (nds) cup, given the pin holes, lack of wrench flats and lack of an outer flange to limit it's thread depth.
This was the drive side cup. The only tool [besides a welder apparently] to install or remove either side of this BB was a pin spanner. The bike is a late 60's bridgestone if that makes a difference.


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Originally Posted by I_bRAD View Post
I think the apparent lack of flange is just a product of the photo. I've seen fixed cups designed for pin spanner installation and removal.
Winner. pin spanner only, no flats for a wrench or other tool.

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Originally Posted by JustCruisin View Post
Use Anti-sieze when you assemble !!! Smoother torqueing, and it will make disassembly possible later.
preach it brother!

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Originally Posted by jccaclimber View Post
Assuming that it would clear your chain stay, or could be bent to do so, you could have welded it in parallel to the chain stay and then used the piece of steel as a lever. I'm also surprised those welds held. Either way, congrats on getting it out, and remember to at least grease the new one.
By grinding the piece of steel to fit into the spindle hole I was able to weld in the center and decrease the likelihood of accidentally welding the cup to the BB shell. The "tab" I welded on didn't need to be that long, I was just too lazy to trim it down.

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Originally Posted by Tapeworm21 View Post
One of my proudest moments. Same kind of bottom bracket that was absolutely not coming out. So I took a hacksaw and cut the cup in half. Then made another cut to make it look like a piece of pie (3 total cuts). Tapped the "piece of pie" out and then tapped out the rest. I then considered myself a genius for a couple days.
Nice.
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Old 01-07-09, 02:54 PM   #14
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Please excuse my booger welds, they held to twist the piece out and that's all that matters...
I've never heard that expression applied to a weld bead... I love it!

Your booger welds rock!!!

.
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Old 01-07-09, 03:26 PM   #15
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Well its not really a bead... more like a booger!
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