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BB unthreading itself(6 posts)

BB unthreading itselfStevieP
Aug 12, 2003 12:48 AM
My 2003 Chorus BB unthreaded itself during a ride this weekend (25 miles from home).

The drive side came out of the frame by about 1.5 cm and the
non drive side went further into the BB shell by the equivalent amount. This caused the left hand crank arm to rub on the BB shell on the frame.

I am waiting for the correct tool to take the BB out and inspect it but can anyone shed any light on why this might have happened?

I note that the 2003 Chrous BB does not have any lockrings to stop this happening.

The BB was fitted by a reputable bike shop.
If it is not super tight and Itallianthe bull
Aug 12, 2003 3:29 AM
it is common.I recenly heard of an English one doing it on this board.But only seen Itallians ones come loose in "real life".Might be a good idea to stick some treadlock on the driveside.I have also seen people use pipe tape(the thin white stuff that costs 89 cents) on the treads to keep it in place.
If it is not super tight and ItallianStevieP
Aug 12, 2003 4:09 AM
Its a Colnago from 1997 so I guess it would be Italian. Threadlock seems a good idea.
then it's Italian...russw19
Aug 12, 2003 4:43 AM
First off, the tool you need is the same as the Campy lockring tool. You can use a threadlock, but you really just need to get it tight enough, and then you won't have anymore problems. The thing about Italian BB's is that they require a lot of torque to keep them tight. More than most mechanics who work mostly on English threaded stuff realize. The thing is that if you don't tighten an English BB enough, pedaling will usually take care of it for you, but not with Italian. Just use a long leverage bar when you tighten it down, and don't worry about over tightening it, you most likely are not getting it tight enough... torque that sucker and it will stay in there until you want to get it out (which will require an equally long leverage bar..)

I put a couple drops of blue lock-tight on my BB in my Pinarello, but as long as you get it tight enough, you won't need to do that.

Good luck,
then it's Italian...StevieP
Aug 12, 2003 4:55 AM
Cheers guys
proper torqueDaveG
Aug 12, 2003 8:51 AM
My Italian BB went loose on me last year. When I re-installed it (this time with a torque wrench) I could not belive how much force needed to be applied to reach the 50+ft/lbs of torque that is called for. I never would have tightened it that much without the torque wrench. It has not come loose again in over a year. I did use Teflon tape. Whether that mattered or not I cannot tell.