JoNnY__Mc Posted September 17, 2012 Report Share Posted September 17, 2012 (edited) Having a nightmare with my frame, thought the threads would hold up but they haven't. I have already tried using glue/liquid metal but half way through the ride the bb worked its way loose again. Does anyone know where I can buy a threadless isis bb? Or something like this: Alternatively how difficult would it be to alter the bb to a spanish bb style with some modification as used in new echo frames? Edited September 18, 2012 by JoNnY__Mc Quote Link to comment Share on other sites More sharing options...
clerictgm Posted September 18, 2012 Report Share Posted September 18, 2012 maybe weld your bb to frame? Quote Link to comment Share on other sites More sharing options...
Blake Posted September 18, 2012 Report Share Posted September 18, 2012 don't think welding is really possible, as you can't access the inside of the bb tube when there's an axle in it. Hopefully someone will be able to tell you if that spanish idea will work because to me it makes perfect sense Someone on here said about using threadless square taper BB's which just pressed in, like headset cups. Have you tried using araldite? that stuff holds anything in. Quote Link to comment Share on other sites More sharing options...
bing Posted September 18, 2012 Report Share Posted September 18, 2012 Alternatively how difficult would it be to alter the bb to a spanish bb style with some modification as used in new echo frames? it can't be done, as the two sizes of bb shell are completely different. the bearings on a spanish bb are a lot bigger than a standard threaded bb shell. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted September 18, 2012 Report Share Posted September 18, 2012 it can't be done, as the two sizes of bb shell are completely different. the bearings on a spanish bb are a lot bigger than a standard threaded bb shell. I've seen riders do it before, it's just not that easy to do and if you mis-align the bearing seats then you're pretty much screwed. EDIT: This was Mark... EDIT 2: This is an Echo bearing on a fairly normal sized BB shell: Quote Link to comment Share on other sites More sharing options...
JoNnY__Mc Posted September 18, 2012 Author Report Share Posted September 18, 2012 DrStix, I have already tried araldite Mark, it doesn't look impossible. However I feel that it would require a lathe or similar to get it bang on! The way I was thinking of doing it was to file down the bb shell. Additionally use some tubing with the same diameter of the inside of the bb shell which is cut down to the right width to act as bearing seats. This would also be glued into place. Quote Link to comment Share on other sites More sharing options...
bing Posted September 18, 2012 Report Share Posted September 18, 2012 if you are gonna attempt it with a file, have some money in the bank for a new frame, because you would never get the bearing lined up accurately enough, filing by hand, to get it spinning freely. and this will wreck the bearings in a very short time. if you are insistent on going down this route, take it to an engineers shop and get them to use a tank cutter on it. it's basically an arm with a cutting tip on the end that will bore out your bb shell. Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted September 18, 2012 Report Share Posted September 18, 2012 http://www.sjscycles.co.uk/yst-sealed-bearing-bottom-bracket-threadless-bb-993-prod4521/?src=froogle Sq taper, cant seem to find an ISIS version. I suppose you could have the BB shell reamed, a spacer lathed up to sit between both bearings and a donor axle from a fekked bottom bracket? Quote Link to comment Share on other sites More sharing options...
Mike Winton. Posted September 19, 2012 Report Share Posted September 19, 2012 You need a milling machine or a pillar drill with a decent vice and some vee blocks to hold the bb shell straight. so long as there's enough material it can be done within half an hour!The spacer will be easy to make on a lathe or with a file you can file anything just as accurate as a machine will cut it. Just need an axle Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.