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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 09-25-04, 06:34 PM   #1
Honeycomber
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Loud Squeeking when Pedaling

Hi this is my first post and I must say I am a total n00b when it comes to mechanics.

I ride a old repco lakeside mountain bike to work each day and over time it has developed a loud squeek when I pedal. I asked one of the guys at work about it and he identified the problem as loose cotter pins giving me brief instructions on how to fix the problem.

As I am a total n00b I'm worried that I will do something wrong and end up having to walk to work which is quite a distance.

Can someone help me out with some images or detailed instructions on how to fix this without damaging the bike?
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Old 09-25-04, 07:47 PM   #2
John E
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Are your cranks indeed affixed with cotters, which run perpendicular to the bottom bracket shaft? These went out of style before mountain bikes became popular. Most bikes built since the late 1970s use cotterless cranks, which are affixed by a bolt which threads directly into the (hollow) spindle, or, occasionally, by a nut which threads directly onto the (solid) spindle. You can tap the blunt ends of your cotters with a rubber mallet, and then tighten the nut on the opposite side carefully (8 or 9mm bolts are very easy to shear off). You can tighten a cotterless crank's fixing nut with a socket wrench, usually 14 or 15 mm.
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Old 09-25-04, 09:46 PM   #3
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could be a loose crank arm bolt, a loose pedal, or possible, lke happened to me; as simple as dry threads between the bottom bracket housing and cassette. hope it is one of these simple things. if it is an old cone and bearing type bb, could be dry and need overhauling/greasing. good luck
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Old 09-25-04, 10:00 PM   #4
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Actually I dont think it has cotter pins.
I tried loosening the pedal arms and then opening the crank but i'm worried the bearings will fly out or something. I really don't know what I'm doing with bike mechanics and don't want to walk to work.

All I know is that its dry in there and rusty.

Thanks
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Old 09-26-04, 05:14 AM   #5
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Quote:
Originally Posted by Honeycomber
Actually I dont think it has cotter pins.
I tried loosening the pedal arms and then opening the crank but i'm worried the bearings will fly out or something. I really don't know what I'm doing with bike mechanics and don't want to walk to work.

All I know is that its dry in there and rusty.

Thanks
Dry and rusty doen't sound good. Take a look at the Park Tool website and proceed with caution.


http://www.parktool.com/repair_help/FAQindex.shtml

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Old 09-26-04, 05:40 AM   #6
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Why not take it to the LBS? I'm not certain tackling a bottom bracket is at good first project for someone with your admitted unfamiliarity with bike mechanics.

Good luck.
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