New fangled (for me anyway) Bottom Brackets - Tips Please

[ianrauk]

Looks like it has been screwed in at an angle.

 

[raleighnut]

Looks cross threaded to me too, good job it's only Nylon.

 

[psmiffy]

It transpires that pre-load caps come in different lengths - It would seem I have the 2015 cranks and a 2016 pre-load cap or vice versa

 

[psmiffy]

Looks like it has been screwed in at an angle.

No - it is the angle of dangle of the picture - screws in easily and then stops

 

[Crackle]

I'm pretty sure that funny metal thing, the lock spacer should be down not sticking up. Although in truth I took mine off altogether as it was a pain and I was confident my crank wasn't going to come off.

 

[Yellow Saddle]

The pre-load cap is not seating against the crank face - do I have the wrong length pre-load cap?/ View attachment 136353

Houston. We have a problem.

There is something wrong there. I suspect you have too many spacers in the BB and now the crank spindle is too short. Show a picture of the inside of the crank where the preload cap goes. Shine a torch so there's light for the camera to see. Don't ride this yet.

Just to recap. How wide is the BB and how many spacers and where did you use?


Edit: I just saw your post about caps coming in different lengths. It makes sense that you have the wrong one. Looking at its head, it is too small too. Wrong cap. Assuming all else is right, it is safe to ride the bike but get a new cap (actually called a preload bolt).

 

[psmiffy]

Assuming all else is right, it is safe to ride the bike

Not really - no wheels, no brakes - actually not much else apart from a bottom bracket - Just come back from my NVLBS - I was told there are 6 different lengths of pre-load cap - hope I have the right one now

I'm pretty sure that funny metal thing, the lock spacer should be down not sticking up.

yup - but not while you are messing - there to prevent you over-tightening the crank bolts

 

[raleighnut]

Not really - no wheels, no brakes - actually not much else apart from a bottom bracket - Just come back from my NVLBS - I was told there are 6 different lengths of pre-load cap - hope I have the right one now



yup - but not while you are messing - there to prevent you over-tightening the crank bolts

The tag actually stops the crank arm falling off too by the little tang in it sitting in the machined groove in the through shaft.

 

[psmiffy]

The tag actually stops the crank arm falling off too by the little tang in it sitting in the machined groove in the through shaft.

and that as well

 

[_aD]

It's like reading my attempts at "fixing things I don't usually fix". Like that time I went to replace a spoke in the rear wheel and ended up having to take the thing apart, having purchased several new tools. It was nice to clean out and re-grease the cassette, hub et al, but I was expecting a rather simpler job :-D

I'm not alone! Thank the Eddington I'm not alone!

 

[psmiffy]

It's like reading my attempts at "fixing things I don't usually fix"

I'm glad someone is happy - - because in about ten minutes time I'm going to attempt to fit the cranks again - and this time it had better work

 

[psmiffy]

The offending article fully installed -

 

[Bollo]

The tag actually stops the crank arm falling off too by the little tang in it sitting in the machined groove in the through shaft.

In an attempt for the world record for most OT post ever, I love the word 'tang'.

Glad you got it sorted @psmiffy. Apart from one bike, all mine have been hollowtech and they've been fine to ride and replace. My ride chum had an FSA (SLK I think so not cheap) chainset/BB that was made of the runniest cheese available. It nearly trashed his whole frame when the crank came loose.

 

[Crackle]

View attachment 136637

The offending article fully installed -

Honestly Smiffy, you've filthied that frame up a bit.

 

[psmiffy]

Honestly Smiffy, you've filthied that frame up a bit.

Dinnae wurry - noticed it in the photo - sweet now