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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 12-18-07, 06:37 PM   #1
sevinator77
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bottom bracket issues

Ok.

I have a 07 Diamondback Response Sport and lately i've been having a few issues with it.

The main problem is the bottom bracket.

It keeps coming loose, and I do not know why. I checked the threading and nothing is stripped or anything like that.

The bottom bracket itself isn't all that great to begin with i know (it's basically a department store bike anyway). But its a Truvativ X-flow crank. It has those stupid tapered bracket ends. If any of that helps.

any suggestions or solutions?
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Old 12-19-07, 02:19 PM   #2
cachehiker
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http://www.parktool.com/repair/readhowto.asp?id=94 refers to loctite #242.

I don't know if that's the same "blue" removeable loctite that I occasionally use on rack screws and miscellaneous bolts. It's a once or twice a year thing and the label came off my bottle long ago.

In any case, 360 inch pounds of torque is a lot of force if you're using a relatively short wrench. I've had a couple of BB's (one square taper and one ISIS) work themselves loose solely because I was wrong about how tight I'd gotten them. Once I had bought the adapter I needed and fetched the torque wrench from the roll around, it was clear I was only tightening them to about 220 inch lbs. This fixed both problems sans loctite.
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Old 12-20-07, 04:32 PM   #3
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i seemed to have found the problem.

the spacer between the drive side crank and sprocket cracked and got itself jammed into the bearings. it jammed everything up and thats what made it come loose.

i just gotta get a new spacer

but thanks for the input =)
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