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Record BB doesn't stay 'tight'(6 posts)

Record BB doesn't stay 'tight'maurizio
Jan 20, 2004 1:02 PM
Anyone out there use serviceable locktight on their Campy BB's? If I tighten my BB tight, then the spindle does not spin freely one bit, but if I back it off just a smidge to allow a little freedom, the BB cup loosens within a few hundred miles.
Any solutions out there? Italian BB-threading by the way..
something is wrong....C-40
Jan 20, 2004 2:06 PM
You either have a bad bottom bracket, misaligned threads in the BB shell, or the drive side of the BB shell needs to be faced to make it square to the threads. If the threads are misaligned, it's virtually impossible to repair. You only get one chance to machine the threads in alignment.

A properly functioning BB should turn freely when torqued to spec.

I assume that the binding occurs when the left hand cup is tightened. The right hand cup should always be torqued first, then the left-hand cup.

I had a similar problem with FSA ISIS bottom brackets. The first one I got worked perfectly. Another that I bought later and installed in the same frame bound up when the left-hand cup was tightened. A replacement worked the same way. The THIRD one worked acceptably.
something is wrong....Rusty Coggs
Jan 20, 2004 5:37 PM
Yeah.With italian threading, the drive side needs to be extra tight. You might try going not quite so tight on the nondrive side with some teflon tape or non permanent loctite on the threads.
make sure the cups are on their correct side...(nm)RemmingtonShowdown
Jan 20, 2004 3:53 PM
70nm on the drive side, at least 30nm on the left if bindingterry b
Jan 20, 2004 7:05 PM
just finished installing one tonight. the instructions are quite clear - use 70nm on the right and tighten the left to the same spec if it can take it. if there is any binding, take out the left side cup, apply "threadlock" and torque it to 30nm.

If you're getting binding when you properly torque the drive side, I'd suspect the BB is defective.
re: Record BB doesn't stay 'tight'curlybike
Jan 20, 2004 7:41 PM
If you were not careful, one of the grease seals around the spindle may be facing the wrong way. When you look inside the cup when it is off the BB you should see a pocket in the seal surface. If the whole thing looks flat, turn it over and reassemble the bb. The bind should be gone.