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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 06-26-07, 12:02 PM   #1
BKbroiler
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Bottom Bracket Stuck

My bike (Trek SU100) started creaking every pedal revolution and I was pretty certain the bottom bracket was the problem. Somehow I stripped the threads on my right crank arm trying to remove it but got my LBS to remove it (i think by heating and pounding on it). Now, I just got it back home and tried to take the BB out but it won't budge, and I am turning clockwise since it's on the right side.

Could something have happened to prevent it from turning?

Or, does anyone know if the SU100 has right-hand threads on the right side? I tried turning the other way a little but didn't want to risk getting it even tighter. I also checked the Trek literature on this but it wasn't much help.
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Old 06-26-07, 12:10 PM   #2
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Trek should be BSC thread so CW is the way to go. Penetrating oil (PB Blaster), ammonia, and oxalic acid (deck bleach) are some of the favorites on this site. Not sure which metals you have to separate. Heat and a long a$$ wrench are also your friends.

And welcome to BF.
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Old 06-26-07, 02:04 PM   #3
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Thanks, glad to be here.

The frame is aluminum and I'm guessing the BB housing is steel?

Looks like I'll get to work, and maybe find a cheater bar or something.
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Old 06-26-07, 02:45 PM   #4
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ammonia dissolves aluminum corrosion, oxalic acid for steel, and I'm assuming the PBB works better on steel,too. May have to try more than one.
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Old 06-26-07, 03:41 PM   #5
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How certain are you that it's the BB? Creaks and other noises can seem to come from the BB but the cause can actualy be pretty much any component on your bike.

Without guessing and testing each one you can't know for sure.
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Old 06-27-07, 06:01 AM   #6
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I bet you're right about it being the BB. Keep working at it, they can get totally stuck. +1 to the bigass wrench. My favorite combo is the correct sized socket with a 25" breaker bar. The other technique is to put the BB tool in a bench vise and use the frame as a wrench.
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Old 06-27-07, 05:16 PM   #7
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Yeah, I checked some other stuff but the creak definately seemed to be coming from that area, so I perfromed the BB test on the Sheldon Brown's site and got a positive result.

I got some PB Blaster today but no luck yet. The only handle I have for it is pretty small, but my roommate is going to borrow a big ratchet from his work tomorrow so we'll see. That's a good idea about the vise though, too bad I don't have one.
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Old 07-04-07, 02:38 PM   #8
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So, I broke the ratchet that I had borrowed so I went out and bought a nice big breaker bar. That, generous amounts of PB blaster and a mighty heave did the trick. Thanks for your help everyone.
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