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Damn Italian thread bottom bracket!(8 posts)

Damn Italian thread bottom bracket!dawgcatchr
Aug 11, 2003 6:54 AM
Hi. I just had my Italian thread BB (drive side) unthread on me yesterday (I caught it before it unthreaded completely). It was installed up to torque specs 800 miles ago. What can I do to keep this from happening again? BTW, I am using a bike with a Ti BB shell
Was it the drive side that unthreaded? nmshrEd
Aug 11, 2003 8:45 AM
Aug 11, 2003 9:28 AM
re: Damn Italian thread bottom bracket!Tommasini
Aug 11, 2003 10:00 AM
With my steel and Al frames I coat the threads of the BB shell (drive side) with grease strarting about 1/4" in. Then the last 1/4" of threads on the right cup I use blue Locktite. Some might suggest using locktite for all the drive cup threads but I have had great success with just the 1/4" amount.

When it has come time to pull it out (sold the frame, etc) I have used a hair dryer to heat up the BB and so when I put a wrench on it the cup comes out ok.
don't blame the Italians...C-40
Aug 11, 2003 10:31 AM
Although a RH thread might unscrew more quickly after it is has come loose, it will not come loose more easily, just because the threads are right hand.

Grease the threads and torque to the high side of the spec. Greasing insures that you get the maximum tension.

You could also have a problem with the face of the BB shell not being square to the threads. If this is the case, you will continue to have problems, until the BB shell is refaced.

I've not had a single problem with an Italian BB over the last 9 seasons.
It's all about torqueKerry Irons
Aug 11, 2003 4:35 PM
Clearly, the torque setting is not a precise number, but reflects a range. You now know that whatever number you went to is not high enough. Reinstall with more torque. Back in the day, I would install the fixed cup by reefing on the wrench, and then giving a few taps with the hammer to make sure it was firmly seated. In 16 years and 90K miles of riding a IT BB, it only came loose once (I had neglected the hammer tap).
re: Damn Italian thread bottom bracket!Gripfer
Aug 11, 2003 8:13 PM
Question: what is the threading on the Italian BB?
re: Damn Italian thread bottom bracket!LC
Aug 11, 2003 8:26 PM
36 x 24 TPI Both sides are right hand threaded.