stuck bottom bracket

[Ajax Bay]

View: https://www.youtube.com/watch?v=9uwdm9byD6w
- very careful with the hacksaw blade, taking into account the thread on both sides of the frame.
Cyclechat.net/thread:Removing-seized-bottom-bracket-drive-side (from 2012) - NB @Smurfy post and @PpPete use of a small child (early lesson in moments and weak Daddies).

 

[roger44]

I love the internet, you can find the answer to anything, thanks guys

 

[roger44]

well I have to say so many thanks to all you guys that offered encouragement, advice and went to the trouble of searching you tube for me,
Its finally given in and is coming out,
I was the skewer that did it. I rigged something up and its turning
Ive just come in to say thank you all, and Im having a cup of tea while it soaks a bit more in wd40

the worst is over, should be back on the road next week

 

[cyberknight]

This shows what Adrian is describing:


View: https://youtu.be/E2dA4UBJNlE

That sir is fecking brilliant

 

[PpPete]

Cyclechat.net/thread:Removing-seized-bottom-bracket-drive-side (from 2012) - NB @Smurfy post and @PpPete use of a small child (early lesson in moments and weak Daddies).

Said small child is now 6ft+ but still recalls this lesson, and occasionally pops his head out his cave to grunt an offer assistance to aging parent.

 

[roger44]

OK guys, next question
the new ISIS 68/73 BB is too long and I cant tighten the drive side all the way up to the housing face.
It came with a plastic square washer and an O ring.
I have fitted the chain ring and it looks as though it needs to move inboard about 2 mm to be equi spaced about the cassette.
Have I got the wrong size BB? Do I need additional plastic spacers???
I have asked a two different bike shops and they say I shouldnt need spacers at all. if thats the case, I have the wrong size BB

 

[Tim Hall]

OK guys, next question
the new ISIS 68/73 BB is too long and I cant tighten the drive side all the way up to the housing face.
It came with a plastic square washer and an O ring.
I have fitted the chain ring and it looks as though it needs to move inboard about 2 mm to be equi spaced about the cassette.
Have I got the wrong size BB? Do I need additional plastic spacers???
I have asked a two different bike shops and they say I shouldnt need spacers at all. if thats the case, I have the wrong size BB

IME the drive side is put in first, so it should tighten to the housing face. Then do the non drive/adjustable side as far is it will go. Then have another look at the spacing.

 

[roger44]

yes I did that Tim but I cant get the drive side to do up all the way, 2/3 mm gap

 

[Ajax Bay]

the new ISIS 68/73 BB is too long

What is the BB you're trying to fit? (link?) What is the writing on it? It can't be 68 AND 73 [Edit: this is wrong - it can be - thank you TH].
What is the dimension of the frame (face to face)?

 

[Tim Hall]

What is the BB you're trying to fit? (link?) What is the writing on it? It can't be 68 AND 73.
What is the dimension of the frame (face to face)?

Yes it can. Here's a link to one: https://www.ebay.co.uk/itm/Kooka-Is...578549?hash=item3d3e70b3f5:g:srkAAOSwl-FXMxhr

I think the 5mm difference is done with a spacer. Anyway, back to the drive side not going in: That suggests perhaps the thread in the shell is damaged. Getting that cleared and the drive side all the way in should fix the chainline issue. The length of the axle is what determines the the chainline not the shell width.

 

[roger44]

Kooka Isis Bottom Bracket 68/73 shell 113 axle

frame measures 68mm

and here is why I think Im on a hiding to nothing, the distance between the two flanges when fully assembled on the BB is 77mm.
so how the hell can that assemble to a frame width of 68

 

[Tim Hall]

Kooka Isis Bottom Bracket 68/73 shell 113 axle

frame measures 68mm

View attachment 386034

and here is why I think Im on a hiding to nothing, the distance between the two flanges when fully assembled on the BB is 77mm.
so how the hell can that assemble to a frame width of 68

Because one part (the adjustable cup) should move.

 

[roger44]

fully in the dist between the flanges isd 77mm it floats nicely but wont go in any closer than 77mm

its as though the floating ring is too long, If I was to cut 10mm off it, it would fit perfectly

 

[Tim Hall]

fully in the dist between the flanges isd 77mm it floats nicely but wont go in any closer than 77mm

Going back a step or two, the drive side (fixed cup) should/must go in until it's hard against the BB shell. Did the old cup get destroyed during removal? If not, can you try screwing that in and see how far it goes? BB thread are quite fine, so cross threading is an easy thing to do.

 

[roger44]

the old bracket is threaded much shorter 13mm compared to the new one 18mm.
and the old floating ring is also much shorter in threaded length.
I need to get this new bracket changed, dont I, its never going to fit unless i fit a load of spacers under the flanges to pack it out, but thats ont going to cure the chainline