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PostPosted: Wed Sep 26, 2012 8:30 pm 
Old School Grand Master
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Joined: Sun Aug 21, 2011 11:57 pm
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Location: Antwerp, Belgium
That's going to be a tough one to put a collar on. There just isn't enough headtube above those headtube-toptube welds.

So IMO you can either drill the hole and pray that the crack doesn't continue to grow, have the crack welded or have the headtube replaced.


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PostPosted: Wed Sep 26, 2012 8:41 pm 
Old School Grand Master
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Location: Herts UK
clamp nor external ring is not going to go on due to the weld.


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PostPosted: Wed Sep 26, 2012 9:25 pm 
Retro Guru

Joined: Wed May 18, 2011 9:26 pm
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Location: essex
I will have a ring around tommrow to see how much it will cost :(


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PostPosted: Thu Sep 27, 2012 12:11 am 
retrobike rider
retrobike rider
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Location: A wretched hive of scum and villainy...
Yup, I agree, there's just not enough free tube to clamp.
That's a new head tube, or a repair weld... :(

IMO with a 3.5mm wall, grind out crack to v. 30% internal, 60% external. I'd do an internal sealing run then the outside, hot and fast. Start on the top edge and weld down to the root of the crack. 7005 isn't as hot crack sensitive as 6061, but still best to avoid extras stress on avoid the finish pool. Assuming this frame is 7005, make sure they use 5356 or ideally 5180/5183 filler rods, not 4043.

PM if you have no luck locally...

All the best,


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PostPosted: Thu Sep 27, 2012 4:28 pm 
Gold Trader / MacRetro rider
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Joined: Sun May 25, 2008 11:03 am
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Location: Sunny Glasgow
I think if we were to xray our alloy frames from yesteryear we might find them with a number of small cracks. :?


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PostPosted: Thu Sep 27, 2012 4:59 pm 
.o.T.M Triple Crown Winner
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Joined: Sun Dec 31, 2006 12:59 pm
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Location: Sunny South of France
I don't think this crack kills your frame. A crack is very bad when it's touching a weld.

Why not sticking with epoxy the cup of your headset ? Or using a cup long enough…
Perhaps you got this crack since a long time. Perhaps the day the cup was installed in the head tube…


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PostPosted: Thu Sep 27, 2012 8:39 pm 
Retro Guru

Joined: Wed May 18, 2011 9:26 pm
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Location: essex
Its going to cost around £50 ish to fix.Might as well buy another one without the cracks for that.

Who does deep headset cups :?:

Might try that one and drill the end of the crack to stop it getting any longer!! :?:


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PostPosted: Fri Sep 28, 2012 10:37 am 
.o.T.M Triple Crown Winner
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Location: Sunny South of France
whayne wrote:
Who does deep headset cups :?:


My english is not fine enough : I would say a deeper or longer headset cup.
Headset cups "tubes" which fit into the head tube are around 12 or 15mm long. I know that Chris king made longer cups for harder riding… But for the price of your frame.

whayne wrote:
Might try that one and drill the end of the crack to stop it getting any longer!! :?:

Yes, 1mm drill diameter is enough.
2 component epoxy glue (like for bounding frame) and stick the cup.
In there zone, I think only the cup works, not the frame tube :wink:


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PostPosted: Fri Sep 28, 2012 1:10 pm 
Retro Guru
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Joined: Fri Sep 19, 2008 4:37 pm
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Location: North West
What headset size does it take ?

WD :D


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PostPosted: Fri Sep 28, 2012 4:09 pm 
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Joined: Wed May 18, 2011 9:26 pm
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Location: essex
Its a 1 1/8" Head set.


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