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PostPosted: Mon Oct 22, 2012 5:38 pm 
Retro Guru

Joined: Tue Oct 16, 2012 4:16 pm
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Location: NOTTINGHAM
evening all - i picked up an old TT frame (48cm or thereabouts) a few months that has a nasty paint-job and in retrospect is probably going to be too small.

It's 653 tubing and as you would expect very light. Whether I get this re-sprayed is something I haven't decided as yet.

To the question in hand- given the style of frame & the size, why has it got bottle bosses on the underside of the downtube? I've seen them located like this on trekking bikes etc. but on a TT bike?

Bottle bosses are located in the usual place as you would expect on the top-side of the downtube.

Any thoughts or knowledge of this?


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PostPosted: Mon Oct 22, 2012 6:41 pm 
Dirt Disciple

Joined: Fri Nov 04, 2011 10:22 am
Posts: 25
Location: Sweden
If only one on the underside it could be for mounting CO2-cartridges. I have such on my 1990 Carbon/alu Miyata. If two, I'm clueless.


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PostPosted: Mon Oct 22, 2012 7:13 pm 
rBoTM Winner
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Joined: Tue Mar 27, 2012 9:28 pm
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Location: Mansfield Woodhouse, Nott's.
At a guess I reckon the underside bosses have been put on for a Triathlon rider :roll:


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PostPosted: Mon Oct 22, 2012 7:40 pm 
Retro Guru

Joined: Tue Oct 16, 2012 4:16 pm
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Interesting thoughts so far, and I don't discount any answer as I simply cant come up with anything with rhyme or reason.

There are two bosses spaced apart for a standard bottle cage.

They are located too close to the BB to allow for a standard cage / bottle to be installed, it would catch the chainring. If it was for an aero bottle then there is very little chance of reaching down and getting the bottle out, far too dangerous. It could just hold a bidon for storing something but not exactly aero and would add weight?

Perplexed....


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PostPosted: Mon Oct 22, 2012 7:42 pm 
rBoTM Winner
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Location: Mansfield Woodhouse, Nott's.
Gera' picture taken so we can all oggle over it 8)


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PostPosted: Mon Oct 22, 2012 7:55 pm 
Retro Guru

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(Poor Quality) photo....


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File comment: Bottle Bosses
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PostPosted: Mon Oct 22, 2012 7:55 pm 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
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Location: Cumbria
Certainly in the 70's there wouldn't be any bosses for anything down there on a TT frame. There weren't even normal bosses for a bottle cage......Alf Engers never had then and the motto was "driest is fastest".

Picture would be helpful :)

Shaun


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PostPosted: Tue Oct 23, 2012 12:57 pm 
Old School Grand Master
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Location: Completely in the dark, thanks to me good mate Terry....
Judging by the purple/silver "chequered" paint job that looks very much like an Orbit/Sirius product (my America 531c had that colour scheme), if so the fitting is a puzzle as I don't recall Frank Clements offering any peculiar braze-ons for stock TT frames. CO2 pump as already mentioned is my best guess....as an alternative long shot, I don't think Mavic Zap electric derailleurs needed any special fitments for battery packs, did they?

David


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PostPosted: Tue Oct 23, 2012 3:29 pm 
Retro Guru

Joined: Tue Oct 16, 2012 4:16 pm
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Location: NOTTINGHAM
The Mavic Zap! I'd forgotten about those. There is a brochure for the Zap on this site, it doesnt show the system installed though. However, there is a picture of some "apparatus" that isn't the usual component list and had to go somewhere?

How about this - it was a 'recycled' part - originally the tube was cut too short so they simply turned it over, installed the bosses in the correct position and built the frame from there? Just a thought.

And yes, good spot, the frame is a Sirius - that paint job was obviously etched onto your retina's as well - I think it has to go to the paint booth, I wouldn't like to be seen out on it! :oops:


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