Have i messed up the BB threads ?

[Azza]

Hi hubbers

Please could you share your thoughts on what I should do. I have removed an old BB from my roadbike frame, however when removing it, it seems I messed up the threas in a certain spot (as seen in picture) its a really tiny section that is messed up.. So my question is, will I be able to fit a new Bb ? Or wil that small section of messed up thread stop me from fitting a new BB ?

Thanks

And just out of interest, if it is a problem, do you get bike shops who re-thread something like this ?

[TK-Sp3cialiSt]

That could be dirt. I know my lbs has a tool to clean up the threads on a frame just like that

[Azza]

That could be dirt. I know my lbs has a tool to clean up the threads on a frame just like that

 

Nope its not, it seems like it on the picture

[TheV]

Don't stress about it, just take it to a lbs with a tapping tool to clean it up nicely.

[TheV]

Oh... Don't try to force a new BB into the frame, you will mess up the BB. Most good shops will have a tapping and facing tool.

[Azza]

Oh... Don't try to force a new BB into the frame, you will mess up the BB. Most good shops will have a tapping and facing tool.

 

Thanks, so the tapping tool will take away any stripped threads and make the threads like new ?

Edited March 29, 2014 by Azza

[Skylark]

I would try carefully screw in the new bb after cleaning the threads properly with a clean rag and liberally applying oil.

The threads generally still look excellent , can't see signs of cross threading which is normally the problem.

Never heard of damaging threads removing a bb unless it was seriously seized ie you needed to do all kinds of man handling to remove it.

Using moderate force screw in the new bb and screw it in/out as you go to try ease things,if it starts to get really tight or seized before it hits home stop immediately and take it to the lbs. Probably the threads may have been slightly damaged before but seeing a bb has been screwed in and out since I'd say you are safe.

Edited March 29, 2014 by Skylark

[Azza]

I would try carefully screw in the new bb after cleaning the threads properly with a clean rag and liberally applying oil.

The threads generally still look excellent , can't see signs of cross threading which is normally the problem.

Never heard of damaging threads removing a bb unless it was seriously seized ie you needed to do all kinds of man handling to remove it.

Using moderate force screw in the new bb and screw it in/out as you go to try ease things,if it starts to get really tight or seized before it hits home stop immediately and take it to the lbs. Probably the threads may have been slightly damaged before but seeing a bb has been screwed in and out since I'd say you are safe.

 

Yes I had to remove the non drive side cup manually, as it was totally seized.

And when in the cutting it out, I did not realize i was cutting into the threads.

Thats why it is only that tiny section.

[Meentb]

Should turn in just fine. The bb will remove the tiny burr created there.

[Azza]

Should turn in just fine. The bb will remove the tiny burr created there.

 

Lets hope so !!

[The Crazy German]

Lets hope so !!

 

It looks like old damage that has already been retreaded or nudged mostly back into place by the thread of your BB. As said earlier you have not crosstreaded so no mayor issue. Clean and greas and turn new BB in without too much force stop if you really have lots off resistance. Or have retreaded cleaned if you want real peace of mind, though myself with such low damage i would just chuck the new BB in.

[Azza]

 

 

It looks like old damage that has already been retreaded or nudged mostly back into place by the thread of your BB. As said earlier you have not crosstreaded so no mayor issue. Clean and greas and turn new BB in without too much force stop if you really have lots off resistance. Or have retreaded cleaned if you want real peace of mind, though myself with such low damage i would just chuck the new BB in.

 

Thanks !

[droo]

If the new BB needs to be forced in, a visit to a decent mechanic with a BB tap will sort you out. If it goes in easily then no problem.

[Meentb]

So what was the outcome?