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PostPosted: Fri Sep 28, 2012 6:30 pm 
Old School Grand Master

Joined: Sun Jun 27, 2010 9:37 am
Posts: 3976
i have a very deep cupped syncros steel a headset i'd sell. cups are about 25mm deep so should get past the crack.


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PostPosted: Fri Sep 28, 2012 7:16 pm 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4440
Location: Herts UK
^^^^^ don't wish to scupper your potentional sale but why should a deeper headset be a good thing? surely it will put force higher up the head tube thus encouraging the crack to continue? (maybe not if a hole is drilled at the very end of the crack).


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PostPosted: Fri Sep 28, 2012 7:59 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Sat Jul 21, 2007 9:48 am
Posts: 6979
Location: Bristle
frame clearly not interesting enough to warrant a major effort. If it has sentimental value, hang it on the wall. Otherwise, send it to the tip.


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PostPosted: Fri Sep 28, 2012 8:19 pm 
Old School Grand Master

Joined: Sun Jun 27, 2010 9:37 am
Posts: 3976
02gf74 wrote:
^^^^^ don't wish to scupper your potentional sale but why should a deeper headset be a good thing? surely it will put force higher up the head tube thus encouraging the crack to continue? (maybe not if a hole is drilled at the very end of the crack).


thought it would disperse the force through a bigger area.


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PostPosted: Fri Sep 28, 2012 8:42 pm 
98+ BoTM Winner / Gold Trader
98+ BoTM Winner / Gold Trader
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Joined: Tue Feb 14, 2006 9:58 pm
Posts: 3520
Location: the Netherlands
Chris King Steelset


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PostPosted: Fri Sep 28, 2012 9:07 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Fri Feb 01, 2008 4:44 pm
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Location: Republik of Mancunia
If it was mine I'd wall-art it I'm afraid :(

Even if you got it welded it would always play on your mind. Is it worth more than your teeth (or maybe worse than that) to ride something that with a bit of searching you can get again?


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PostPosted: Fri Sep 28, 2012 9:58 pm 
King of the Skip Monkeys
King of the Skip Monkeys
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Joined: Wed Nov 07, 2007 4:34 pm
Posts: 26174
Location: Moomin Valley
buy a Zaskar instead.


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PostPosted: Sat Sep 29, 2012 8:35 am 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4440
Location: Herts UK
.... so in summary

1. leave it as is. chances are crack will continue to develop but IMO (and I may be wrong), there will not be a catastophic failure of the head tube. Worst case scenario is that the lower cup gets loose, starts to spin thus wearing the head tube resulting in a floppy lower race, and that isn't going to happen overnight

2. drill hole and fit the taller cup, the hole should prevent the crack propagating and hopefully the tube exerts strong enough grip to hold the cup in place. unless you have drill press where you can clamp the frame, a 1 mm hole will be hard to drill without breaking the drill bit - you best bet is to either go for a larger drill 2 or 3 mm or use a small electric PCB drill

3. as above but use lumiweld/technoweld (an aluminium solder) .... but i've not had luck with this stuff so i don't think it will hold

4.. repair the tube by welding it - someone ^^^^^ already offered to do that so it would cost you return postage plus a monetary gift for the welder. NB if you are local, I could have a go with my AC TIG but not really used it much so I'm probably as useful as Mike Tyson on mastermind

5. have the head tube replaced(most expensive option)


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PostPosted: Sat Sep 29, 2012 10:32 am 
Old School Grand Master
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Joined: Wed Apr 12, 2006 12:33 pm
Posts: 11105
Location: The Home Of Mountain Biking, And All Great Things.
It is a 96-ish Marin RR.

Nice bike in its day, but you could pick a complete one up for 60/70 beer tokens if you have patience.

...or upgrade to a better frame for similar money.

Might even find a nice 853.

:)


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PostPosted: Thu Oct 25, 2012 9:17 pm 
retrobike rider
retrobike rider
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Joined: Tue Jan 29, 2008 11:04 pm
Posts: 1802
Location: A wretched hive of scum and villainy...
All sorted now :D :

Nasty little Y-shaped crack:
Image
Marked up:
Image
Drilled, relieved and chamfered:
Image[url]
Welded inside:
Image
and outside:
Image
Filed:
Image
Reamed and faced:
Image
Finished:
Image

7005 frame, 5356 rod, AC 110/75 amps @ 200Hz, Alumaxx Argon/20%helium mix, 1.6mm ceriated electrode +.
No post-weld treatment, no guarantee. More pictures here.

All the best,


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