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PostPosted: Mon Dec 19, 2011 1:58 pm 
Retro Guru

Joined: Fri Oct 07, 2011 1:49 pm
Posts: 946
Location: Hampshire
http://www.tocycle.co.uk

Tel 024 7645 0020

Fax 024 7663 5722

Email sales@tocycle.co.uk



I spoke to this company earlier. Of all the people I've spoken to, these have been the most patient, knowledgeable and reasonably priced. Just waiting on an email with a sample of their Ally work. All being well they'll be doing 2 of my frames.


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PostPosted: Mon Dec 19, 2011 2:44 pm 
BoTM Winner
BoTM Winner

Joined: Wed Mar 29, 2006 1:56 pm
Posts: 1020
Location: Guernsey
Loads of good alu weldera in the uk , aerospace or marine places are also good to try.

You may not find those recomended welding rods in the uk but you can use a castolin tig-tectic 21 or 23 rod that will work well:

nimubus welding guide:
http://www.nimbuscycles.co.uk/Welding_Notes.pdf


If you are unsure fo the weld fatiuge and heat treadment. try searching online. it will probably tell you to put in the oven for 6 hours at 200 then 3 horus at 180 then leave for a week or two to get full crystallation.

Also you could have teh bb it reamed and then sleaved with a bonded steel sleve afterwards as the steal sleve with spread the load. argos cycles do this.

Cheers
Pete


Last edited by biglev on Mon Dec 19, 2011 6:24 pm, edited 1 time in total.

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 Post subject:
PostPosted: Mon Dec 19, 2011 6:14 pm 
Old School Grand Master
User avatar

Joined: Wed Apr 12, 2006 12:33 pm
Posts: 11105
Location: The Home Of Mountain Biking, And All Great Things.
I would hang it up on the wall rather than repair it.

Just my take on it, but if you are happy to spend the money why not?

I have rescued some total wrecks in my time, but usually because there is some emotional attachment.

I always have at least two or three old Jap motorbikes in the pipeline, right now looking at four restorations over winter.

But these are steel framed machines.

I just would not have the same confidence in a repair on an Alu BB, as that is a major concentration of stress.

This is possibly due to my ignorance, as I am sure if a well known repairer suggests it is worth doing it must be possible to do it successfully.


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PostPosted: Mon Dec 19, 2011 6:36 pm 
Retro Guru

Joined: Fri Oct 07, 2011 1:49 pm
Posts: 946
Location: Hampshire
Mine has a crack in the head tube. I've seen others that have had a collar fitted top and bottom of the headtube and it looked standard.


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PostPosted: Tue May 14, 2013 10:48 pm 
Retro Guru

Joined: Tue Jun 28, 2011 1:25 am
Posts: 265
Location: bedfordshire. uk
im looking for collars for a a frame that i have got. its got a cracked headtube but luckly there is
about 5-7mm of headtube above/below the welds so i could fit collars and maybe get it welded too.

anyone know where i could get collars?
would it be better to get it welded first and fit steel collars (ally frame) or fit ally collars and have them welded too.?


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PostPosted: Wed May 15, 2013 3:57 pm 
Retro Guru
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Joined: Mon Jul 26, 2010 10:46 am
Posts: 503
Location: Leamington, UK
Umm, if you're worried about distortion/frame damage during the weld repair, why not leave an old BB in place? It should keep things a bit more rigid, and when you remove it, it will hopefully 'chase' the threads back into shape...


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