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PostPosted: Sat Feb 23, 2013 11:05 pm 
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Location: yorkshireland
Ive just acquired myself a lovely poo brown Juchem frame from sunny germany which is confusing me a little. I think it dates back to 1989 and on the face of it seems to have an 1 1/8" headtube until that is I hold a headset up to it, it seems to be slap bang inbetween 1 1/8' and 1 1/4". The internal is very uniformly sized both top and bottom so I do not believe it to be a worn/flared headtube. Are there any folks on here who have such a frame with any pointers towards what I might have? Digging on line I found some pics where a 1990 frame seemed to run a painted in reducer cup, I was wondering if I should have something similar in mine.
I know these are as rare as squid feathers over here but im hoping one of you bike fiends might have a few pointers.
Thanks


Edit.....Heres one of the pics that ive found that appear to run a reducing cup of sorts


Attachments:
Bild065.JPG
Bild065.JPG [ 69.47 KiB | Viewed 544 times ]
jf.jpg
jf.jpg [ 55.52 KiB | Viewed 548 times ]


Last edited by futuristicoldman on Thu Jan 01, 2015 5:38 pm, edited 4 times in total.
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PostPosted: Thu Feb 28, 2013 5:43 pm 
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Anyone?


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PostPosted: Thu Feb 28, 2013 6:24 pm 
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futuristicoldman wrote:
Ive just acquired myself a lovely poo brown Juchem frame from sunny germany which is confusing me a little.



yes, if you poo is that colour I would seek medical advice


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PostPosted: Thu Feb 28, 2013 6:25 pm 
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dinkin double post


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PostPosted: Thu Feb 28, 2013 6:53 pm 
retrobike rider
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What's the exact measurement of the headtube and is it the same diameter all the way round?
Exactly the same measurement?
Same the the other end of the headtube?


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PostPosted: Thu Feb 28, 2013 10:16 pm 
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I dont have it here right now but its roughly 3mm bigger than an 1 1/8" tube, top and bottom are the same. If it is a flared tube I cant begin to think what somebody has fitted for it to open up to such a degree. I tried to turn down an 1 1/4" reducer but it has not left a whole lot of the shim behind.
A few examples on the web like the one above seem to have either a machined step or factory fitted reducer as each example that I could find had the suspected reducer painted to match the factory colours. I half suspect the larger tube may have run a 1" fork originally as there cant have been many builders using 1 1/8" back in 89.
The whole frame is heavy with quirky design features which would not look out of place on a far newer bike. The turd rich powder coat that it is currently sporting somehow seems to hide its more interesting touches.


Last edited by futuristicoldman on Fri May 10, 2013 9:53 pm, edited 1 time in total.

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PostPosted: Thu Feb 28, 2013 11:32 pm 
retrobike rider
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Probably a strange size as it is from before a lot of things got standardised? Or like you say it should have a shim! Raleigh used to make some strange inbetween size headsets, all there stuff was made in-house BITD though so I doubt an American frame would use it!
I don't think it would have been so round if something had been forced in!
It should be fairly easy for someone to knock up a shim on a lathe.
Shame it's the wrong size
It's amazing that there are still bikes out there that most of us haven't heard of!


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PostPosted: Thu Feb 28, 2013 11:33 pm 
retrobike rider
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The above is from the PM.

If you get stuck I might be able to knock something up on the lathe if your in no rush!


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PostPosted: Fri Mar 01, 2013 10:11 am 
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You tried Juchem already?

http://www.juchem-bike.de/


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PostPosted: Fri Mar 01, 2013 10:15 am 
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Under this link more frames with a kind of reducer cup >>> http://www.juchem-bike.de/galerie.htm


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