I installed a hollowtech ii bottom bracket onto this frame about 100 miles ago along with new cranks. While checking the crank arm torque to make sure it’s still tight after those 100 miles I noticed this. Does this mean I should remove the crank arms and retighten both sides of bracket shell again? I wouldn’t think it would spin freely like this when both sides were torqued to specifications.
Is this normal for a bottom bracket?
byu/SilkenB inbikewrench
by SilkenB
11 Comments
Not normal
no way is movement of the bracket shell normal…. btw was that a press fit shell?
Definitely not. If it’s press in you’ll need to shim that somehow or something. If it’s threaded…I got nothing.
yes definitely remove the cranks and tighten up that BB. i would probably remove everything, give it a good clean, then re install. you pretty much want to tighten up the bottom bracket as tight as you can, i think it’s supposed to be around 40nm for most. (which is pretty freakin tight)
Is this a thread together bb for a press fit shell?
Maybe it is supposed to have a spacer and when you installed it the threads bottomed out before it clamped onto the bb shell. Just a shot in the dark I have never seen both sides move together like that.
https://preview.redd.it/0iw4a8y9e0tf1.jpeg?width=251&format=pjpg&auto=webp&s=b5f463ad4269ff0c6abc627a2904f1920d06044c
Might try a bottom bracket wrench and see if you can tighten both sides.
Remove, clean BB and BB shell threads, apply BLUE loctite, reinstall.
Definitely not right. This is an alloy frame?
Must be AI, lol…
İts not I recommend removing the crankset and inserting the bottom bracket. If the teeth are in place, apply anti-sizing and tighten to the specified torque, then reattach the crankset and continue riding.
If properly installed, there should be a space between the crank body and BB, and you do not have it, that’s the reason why cranks “unscrew” your BB…