My BB cup is seized, how can i shift it.

[Psycolist]

I have a bike that I use in bad weather, I have gradually upgraded all the basic bits and bobs so that I feel happy with the overall ride. However, the crank is mounted on an old fashioned square taper BB with seperate bearings , axle and cups. I want to relace this with one of the more reliable sealed units, however seem unable to shift the cup on the drive side. I have stripped down and removed all the assembly 3 times now but always get stuck when trying to remove that last piece. Of course I wish to maintain the integratey of the thread in the frame but really dont care if I end up destroying the offending cup. Any words of wisdom will be greatly appreciated.

 

[Tim Hall]

Get a big nut and bolt. I use an M12 (I think). Then follow the instructions by The Sainted Sheldon here. Scroll down to the Fixed Cup Tools bit. It's a beautifully simple method that Just Works.

 

[festival]

Most bike shops will have specialist tools to remove stubborn cups of all types, usually takes just a couple of minutes.

 

[Manonabike]

I once had the very same problem you are describing and I got my car mechanic to shift it using a vice, terribly simple.

 

[TheDoctor]

Your LBS can shift it. You may want to go for a cup of tea while they do so.
It can get brutal...

 

[Herzog]

I would try liberal doses of Plusgas first before attempting procedures involving extension bars, hammers etc.

 

[subaqua]

or use your wifes hairdryer on the shell as even a small amount of heat is enough to help loosen the things. DO NOT USE NAKED FLAMES as the grease inside ( Ha that would be why we need to strip it down as there is no feckin grease in the bearings) can catch fire

 

[Fnaar]

I managed to remove my wife's cups with a bunch of flowers.

Sent mobile phone stylee

 

[Andy_R]

I managed to remove my wife's cups with a bunch of flowers.

Sent mobile phone stylee

You're not a musician are you? If you are, did you get Tulips on your Hammond Novachord for those flowers?

 

[Fnaar]

You're not a musician are you? If you are, did you get Tulips on your Hammond Novachord for those flowers?

Well, a quick parp on my horn*


*managed to reach high C

 

[Globalti]

The Sheldon Brown bolt method works very well. Just make sure you know which way to turn...

 

[ArDee]

Sorry to ask the question, but as Globalti implied, are you turning it the correct way?
One side has a left handed thread. So the old righty tighty lefty loosey doesn’t work.

 

[subaqua]

Sorry to ask the question, but as Globalti implied, are you turning it the correct way?
One side has a left handed thread. So the old righty tighty lefty loosey doesn’t work.

depends on english italian or french thread doesn't it

http://en.wikipedia.org/wiki/Bottom_bracket#Shell_diameters_and_threading

 

[Psycolist]

Sorry to ask the question, but as Globalti implied, are you turning it the correct way?
One side has a left handed thread. So the old righty tighty lefty loosey doesn’t work.

Ohhhh yes, I have to admit that I wondered that myself , but yes, I am turning, or trying to turn the right way

 

[Psycolist]

Get a big nut and bolt. I use an M12 (I think). Then follow the instructions by The Sainted Sheldon here. Scroll down to the Fixed Cup Tools bit. It's a beautifully simple method that Just Works.

excellent advice, been and had a look, should be a breeze now, famous last words. i had looked at his stuff but couldnt find this bit.......just got to summon up the energy to get it all taken apart again now ! ha.