Hi all!
I have a titanium frame and tried installing two T47 bottom brackets.
Should there be as much play when screwing it in?
Does it appear to be too loose?
There is quite a bit of play screwing it in all the way.
On previous installation, on different frames, screwing it in, is goes in much more snug.
What do you think?
by stfudog
9 Comments
Correction: Play on bottom bracket (T47)
I mean that definitely looks a bit looser then normal. That is alot of play. Did you toss both sides in and see if there was any wiggle?
This is not ok, either the cup and/or the frame threads/diameter are fault.
Might still work ok when you tighten it but not ideal.
3d printed bbs are tricky. The manufacturer will have to cut it out, do a reprint, remill the threads and weld it back onto the frame. Big job. Who’s the frame maker?
That’s too much play. Either bad initial machining or someone got too eager chasing the threads. If it’s a new frame, I would talk to the manufacturer. If that’s not really an option or they tell you to kick rocks, you can probably resolve the issue with some teflon plumbers tape on the threads. As long as you can get it up to torque spec, you should be okay.
Edit: just read another comment where you said the cup is popping lose while tightening. In that case, those are stripped threads unfortunately.
This would be a NO-GO at my shop. Send it back
Is the inner shell moving or is it just a sketchy BB ?
Shortly:
A bit tighter would be nice. But if you can apply the torque as spect for T47, than everything is fine. The Funktion of the thread is not alignment, it’s providing „clamping“ force. The alignment only happens on the BB interface.
Either threads in bb shell are gone or bb is the wrong size? In no world is this acceptable