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Author Topic: Stuck BB  (Read 1732 times)

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Offline Alan

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Stuck BB
« on: December 14, 2009, 08:23:05 PM »
I'm fixing up my brother's bike for xmas (Mid-90's Specialized Hardrock Comp).  I pulled the cranks and noticed the spindle has a tiny bit of play.  I don't have the dinero to get a new square taper BB but I wanted to pull the BB to get the size so that I can tell my brother what size to order.  Left side cup comes out no problem.  I try to loosen the right side to remove it but the bastard will not budge.  I'm putting all of my 210 lbs on this thing and it isn't moving (and yes I am trying to turn it the correct direction). 
 
Any ideas on how to loosen it up?   

Offline Skinman

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Re: Stuck BB
« Reply #1 on: December 14, 2009, 08:29:52 PM »
I had the same problem on my old 92 rockhopper. I hate putting wd40 anywhere near my bike but it worked for this one......I sprayed wd 40, let it sit for a few minutes and used a rubber mallet on the wrench/BB tool. It finally came out and I didnt damage the threads.....
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Offline slowfatguy

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Re: Stuck BB
« Reply #2 on: December 14, 2009, 09:08:48 PM »
I have an entire square taper crankset with BB that is practically brand new you can have if you want/need it. It's a Truvativ crankset with a Shimano BB-UN25.
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Offline drb81

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Re: Stuck BB
« Reply #3 on: December 14, 2009, 09:13:21 PM »
honestly I wouldn't try to pull it out if it's really stuck until you are ready to replace it (yes I understand you need to get the size so you can order a new one) but you might damage something and not be able to ride it for a while. I would tell him he needs a new one and when he has the downtime to tear it apart to replace it, then do it.

I would try some penetrating lubricant (PB Blaster etc.) soak it overnight. You could also try tapping on a block of wood on the spindle (as if trying to knock the BB through the shell) just hard enough to try and break the bond between the threads.
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Offline ProEdgeBiker .

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Re: Stuck BB
« Reply #4 on: December 14, 2009, 09:15:02 PM »
I'm fixing up my brother's bike for xmas (Mid-90's Specialized Hardrock Comp).  I pulled the cranks and noticed the spindle has a tiny bit of play.  I don't have the dinero to get a new square taper BB but I wanted to pull the BB to get the size so that I can tell my brother what size to order.  Left side cup comes out no problem.  I try to loosen the right side to remove it but the bastard will not budge.  I'm putting all of my 210 lbs on this thing and it isn't moving (and yes I am trying to turn it the correct direction). 
 
Any ideas on how to loosen it up?   



I have this crank that my budy wants $30 for:


Offline Alan

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Re: Stuck BB
« Reply #5 on: December 15, 2009, 07:44:02 PM »
Thanks for the info.  Good point on keeping it as is until it really needs to be replaced. 

I'm going to stick with the stock cranks on this bike.  It has these really cool forged "specialized" cranks.  I think they are just rebadged Shimano cranks, but they look really cool.  I'll post pics when I'm done with her. 
« Last Edit: December 15, 2009, 07:48:30 PM by Alan »

Offline Skinman

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Re: Stuck BB
« Reply #6 on: December 15, 2009, 08:07:35 PM »
Did you get the bb out?
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Offline Alan

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Re: Stuck BB
« Reply #7 on: December 16, 2009, 08:28:49 AM »
Not yet. Won't budge even with tapping the bb whilst trying to loosen it.  I will hose it down with WD40 and yank it out once my bro has the money together for a new bb. Bike is still able to be enjoyed right now. Hate for the WD to get into the bb bearings and make the bike unridable.

Offline Darrinw2001

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Re: Stuck BB
« Reply #8 on: December 16, 2009, 08:37:19 AM »
Not yet. Won't budge even with tapping the bb whilst trying to loosen it.  I will hose it down with WD40 and yank it out once my bro has the money together for a new bb. Bike is still able to be enjoyed right now. Hate for the WD to get into the bb bearings and make the bike unridable.

use PB-50 blaster lub instead.... not a solvent like WD40, wont hurt the bb (as far as I know)... can even use it to lube your chain...
« Last Edit: December 16, 2009, 08:41:31 AM by Darrinw2001 »

Offline nick

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Re: Stuck BB
« Reply #9 on: December 23, 2009, 06:17:33 AM »
Use a bolt and washer to hold the BB tool on and use the longest wrench you can find on it.

Offline catman

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Re: Stuck BB
« Reply #10 on: December 23, 2009, 10:04:49 AM »
Use a bolt and washer to hold the BB tool on and use the longest wrench you can find on it.
Very good tip! I had one stuck on my buddies bike a while back so I put the bike on it's side, had someone stand on the ratchet head, and then gave it a really good pull with a super long flex head ratchet. After getting it out I did kinda rethink my method since it doesn't seem like it would take much to split that BB shell. I've also taken a stuck one out with an impact gun but it was only stuck due to stripped tool splines not locked up threads. The impact gun was able to get a bite and spin the cup right out.

Side point: I got a Giant NRS frame free from a guy due to his lbs not being able to get the cup out. Took me a few seconds......so ended up being well worth the risk of splitting the bb shell. Figured I'd pay it forward to a good buddy who was on a pos hardtail......he doesn't even ride it off road anymore.
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