Join Date: Oct 2008
Bikes: Franklin Frames Custom, Rivendell Bombadil
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No Tom .... a cartridge BB does not have to be super tight. If your non DS cup is plastic..... I guess it's a Shimano un-54? WTF ... indeed ! You'll notice as you tighten the non DS cup the bearings appear to get very stiff if you set the DS crank on the spindle. I was uneasy about this , but it supposedly does not affect performance.... at least this is what many mechanics have told me. Mine has not failed prematurely, so there you do. It has AL cups, however, not plastic. I've done it both ways.... with light torque and some light thread lock(not the hard core permanent stuff!!).... and with a moderate amount of torque...... and both work fine. Not exactly science, is it?
A tip here.... grease the inside of the cup well, this will prevent creaking between the cup and cartridge.
I grease the threads of both cups, the DS goes in tight. The non-DS can be also used with a touch of touch of teflon tape(pink plumbers tape) if you want to add some security for the mind against loosening of the cup. But really, the BB is a sealed unit.... as long as the cup is in there with moderate torque and is not moving, you'll get no creaking and no worries.