Need Help Identifying Vintage Frame.

Postby DoctorGenius on Mon 15/Nov/10 8:49pm

Hey all,

I'm not sure if I have posted this in the correct section but I
was wondering if anybody could help me identify the maker of this
frame / give any suggestions / general information about it.

I won it through an online auction and I have the intention of
giving it a new paint job and some new parts but I'm interested
to find out a bit more about the frame before I start.

Serial Number reads : 74143
It has some 'bi-plane' forks which I don't see very often so they
might have the strongest indication of the maker, I'm not sure sure.

Any suggestions? Could it be a Bosomworth?
Headset threads are italian i believe.

Could the serial number 74143 indicate 1974?

Here are some images of the frame:
http://img209.imageshack.us/i/dsc0306j.jpg/
http://img193.imageshack.us/i/dsc0309hd.jpg/
http://img27.imageshack.us/i/dsc0311xj.jpg/
http://img696.imageshack.us/i/dsc0313jg.jpg/
http://img84.imageshack.us/i/dsc0315iz.jpg/
http://img140.imageshack.us/i/dsc0317yk.jpg/
http://img585.imageshack.us/i/dsc0318p.jpg/
http://img168.imageshack.us/i/dsc0319c.jpg/

Forks (appear to have been drilled) :
http://img221.imageshack.us/i/dsc0321x.jpg/
http://img710.imageshack.us/i/dsc0322y.jpg/
http://img690.imageshack.us/i/dsc0323k.jpg/
http://img832.imageshack.us/i/dsc0324m.jpg/

Thanks
DoctorGenius
Member for: 7 years 0 months

Re: Need Help Identifying Vintage Frame.

Postby Oli on Mon 15/Nov/10 9:42pm

I have no idea what it is sorry, but I'm sure it's not a Bosomworth.

You're most likely right about the serial number being related to the date it was made, but sadly lots of builders do/did that so it's not so much of a clue.

The lugs and fork crown look more to me like an English frame than Italian - how do you know it's an Italian threaded headset? They are almost identical to, and interchangeable with, English headsets. The bottom bracket threads would be a better indication, as Italian threaded b/bs are unusual on anything made outside Italy.
Oli
User avatar
Member for: 12 years 3 months

Re: Need Help Identifying Vintage Frame.

Postby musta on Mon 15/Nov/10 10:01pm

I recently sold a frame with similar forks (mine undrilled) and lug work.
Was rode by a NZ junior sprinter 20 or so years ago.
Would take a guess and say its a New Zealand made frame which I'm pretty sure mine was.
But check the BB, if that is Italian at least you cancel out quite a few makers.
musta
Member for: 8 years 2 months

Re: Need Help Identifying Vintage Frame.

Postby DoctorGenius on Mon 15/Nov/10 10:14pm

Thanks for your help.
They guy I got it off said the headset was italian threaded.
I'll try find out more about the bottom bracket if I can.
Would photos of any specific area help at all?

Thanks Musta, I was thinking NZ made too, which
is why I assumed maybe a Bosomworth.
I'm not sure what to check for on the bottom
bracket to see if it is italian. I know the shell
width is approx 680mm which I don't think is
the standard for italian shell widths.

The headset I have for it is a Tange Levin CDS
and the size is 30.2 - 26.4
DoctorGenius
Member for: 7 years 0 months

Re: Need Help Identifying Vintage Frame.

Postby Oli on Mon 15/Nov/10 10:21pm

Italian b/bs are usually 70mm wide, and the threads are a larger diameter to English (as well as both cups being r/h threads)...

It may well be NZ made, but most likely from lugs and fork crown sourced overseas in either England or Italy.
Oli
User avatar
Member for: 12 years 3 months

Re: Need Help Identifying Vintage Frame.

Postby musta on Mon 15/Nov/10 10:27pm

If you don't have BB cups to check an Italian BB diameter will be 36mm vs. English 34.8mm.
An english bb cup will therefore not even bind/touch the threads properly
musta
Member for: 8 years 2 months

Re: Need Help Identifying Vintage Frame.

Postby DoctorGenius on Mon 15/Nov/10 10:37pm

Cheers I didn't know that.
Going to go with the English Diameter for the BB.
Guess that doesn't narrow it down very much haha
DoctorGenius
Member for: 7 years 0 months

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