Bottom bracket migrating toward drive side
08-27-09, 09:28 AM
#1
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Thread Starter
Bottom bracket migrating toward drive side
I've got a Campy Record cartridge bottom bracket from the 8 speed era. I installed it on a Pinarello Record frame and rode about 12 miles today. I looked down and noticed that the BB had shifted to the right so that the threads of the BB are exposed on the drive side. The other side moved inward so that the crank arm is almost touching the left chainstay. What caused this? How can I fix it?
Thanks in advance!
Thanks in advance!
08-27-09, 09:44 AM
#2
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It sounds like the drive side loosened up and unthreaded itself and the left side followed along. With Italian threads (both sides being RH threading) this is certainly possible. I would take everything apart, clean the threads thoroughly with solvent, and loctite them. Use the blue stuff - not the red. Also be sure to tighten the drive side VERY tightly.
08-27-09, 11:33 AM
#4
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That happened on my Trek 720 recently. I had just left on a 3 day bike tour when I noticed it. I rode back to the house, tightened it up very tight (no cleaning, no loctite) and left again. So far, so good. So... cleaning and loctite is probably a good idea, but perhaps not necessary.
08-27-09, 11:47 AM
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Yes, the drive side cup on the Trek is LH thread and will tend to stay tight without chemical assist as long as it is reasonably tight to begin with. On the other hand, I just last night disassembled a project bike I'm working on that has standard threading and I was surprised at how untight the drive side cup was - just above finger tight and it has seen many hundreds of miles in that condition withoug loosening any further.
08-27-09, 12:30 PM
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08-27-09, 02:23 PM
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Loctite...
Be careful with blue Loctite when applying to really fine threads. Though I have never experienced difficulty with steel threads, alloy threads can actually be damaged upon removal. The finer the thread, the greater the risk when alloy is concerned. You can get a Loctite product for small threads. It is red in color also, like the really strong stuff but it is much safer to use and does just a nice a job, in my opinion.
By the way, I used to ride vintage Harley Davidsons and I fell in love with Loctite.
By the way, I used to ride vintage Harley Davidsons and I fell in love with Loctite.
