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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 09-28-11, 10:42 AM   #1
chandltp
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one piece bottom bracket swap

So I got an old Murray for $5, but the frame doesn't fit as well as my old Huffy (and I noticed some frame damage that makes me nervous after I brought it home). I bought it because all the parts appear pretty much identical and I was going to use it as a donor cycle for my winter riding. After 2 years of salt and neglect, the components are screaming.

The replacement has a triple on the front instead of a double, but everything appears to be the same component wise.

I found Park Tool's page on how to do this, but I'm only going to do this once (or maybe twice if I find a new donor), so I don't want to buy a bunch of tools for this.

Is there a good way to do this with some improvised tools?
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Old 09-28-11, 10:52 AM   #2
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When I was a kid, I'd use a large adjustable wrench, groove joint pliers, screwdriver and hammer (dad wasn't too thrilled that the screwdriver and hammer were used together).
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Old 09-28-11, 10:58 AM   #3
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Try the guide here www.atomiczombie.com for some slightly 'low tech' methods. The only real thing to remember is that the threads on the left side are left-hand (reversed) threads, so you'll need to turn parts clockwise to loosen.
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Old 09-29-11, 12:03 PM   #4
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Monster Pet, thanks for the page.. I think I'm going to try those brute force methods.

My current BB is badly rusted from the salt. Would some of the liquid wrench on it before I start be a good idea, or is there something better to use?
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Old 09-29-11, 12:05 PM   #5
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Quote:
Originally Posted by chandltp View Post
Monster Pet, thanks for the page.. I think I'm going to try those brute force methods.

My current BB is badly rusted from the salt. Would some of the liquid wrench on it before I start be a good idea, or is there something better to use?
I prefer PB Blaster but doubt there is a huge difference between the two.
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