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Show Us Your Seat Lugs

Old 07-26-22, 08:08 PM
  #126  
rjhammett
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Old 07-26-22, 08:30 PM
  #127  
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My Touring And Rough-Stuff Frames - Nothing Fancy

I built this frame for touring in 1975-76. It sat unpainted until 1992 because in late 1976's we started rough-stuff riding off road on road bikes and I never got back into touring.

Hand cut lugs and flat seat stay caps ala Bertin except smaller to fit the 1/2" pencil seat stays.



Rough-Stuff frame I built in 1992 for off road trekking. Nothing fancy, just functional and well built... Done in one day sort of.



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Old 07-26-22, 09:19 PM
  #128  
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A Few More Frames

For me the finish on the seat lugs and stay tops has always been a sign of the quality of workmanship on a frame. Even if it's a plain production model.

My 1965 Swiss made Tigra.... Super crisp lines.



1975 Raleigh with "Brampton Shot In" fast back stays. Sloppy true to Raleigh form...



1973 B. Carre built Lejeune Champion Du Monde



1971 Hetchins Italia



Early 80's Gios Torino



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Old 07-26-22, 11:32 PM
  #129  
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Originally Posted by smd4
Withholding one little bit of information… or even many bits…won’t result in fewer book sales. But it is uncool, especially when you’re holding yourself out to be an expert in a subject.

—smd4, who has two hobby-related books in the Library of Congress.
Fascinating!**

Though I love me some free book-publishing advice, how about some more seat lugs?

Bianchi Competizione, mid-'60s maybe?


Bianco, circa 1947:


Caminade Caminargent, probably around 1950


Eisentraut, circa 1981:


Jeff Lyon, circa '86:


OK those last two aren't lugs, blame my poor reading-comprehension.

Mark B
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Old 07-27-22, 06:00 AM
  #130  
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Old 07-27-22, 06:22 AM
  #131  
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Old 07-27-22, 06:29 AM
  #132  
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Originally Posted by bulgie

Eisentraut, circa 1981:


.........
Mark B
I'd seen photos of those unique Eisentraut seatpost binders before, but this shot showing the hole for the binder makes it obvious just how much of the top tube was removed to make room for the binder.
It does make me wonder how much the strength of the tube was compromised, and did Al add an inner sleeve (or something else) to compensate??

It also makes me appreciate the simplicity and mechanical efficiency of the conventional seatpost binder bolt arrangement, even if it's not the most streamlined.

As a bit of a tangent, how well did the Eisentraut design work? Any problems with seatpost slippage?

Steve in Peoria, blessed, or perhaps cursed, with conventional seatpost binder designs.
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Old 07-27-22, 05:18 PM
  #133  
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Originally Posted by steelbikeguy
I'd seen photos of those unique Eisentraut seatpost binders before, but this shot showing the hole for the binder makes it obvious just how much of the top tube was removed to make room for the binder.
It does make me wonder how much the strength of the tube was compromised, and did Al add an inner sleeve (or something else) to compensate??

It also makes me appreciate the simplicity and mechanical efficiency of the conventional seatpost binder bolt arrangement, even if it's not the most streamlined.

As a bit of a tangent, how well did the Eisentraut design work? Any problems with seatpost slippage?

Steve in Peoria, blessed, or perhaps cursed, with conventional seatpost binder designs.
Though the sides of the TT are mostly gone, the stress is low there. Almost all the stress at that point is bending from the cantilevered load on the saddle, leverage-amplified by the seatpost stickout. That bending load primarily stresses the top and bottom of the TT, with the removed metal being close to the unstressed neutral axis.

I never owned one so I can't comment on efficacy or durability, but I trust Eisentraut enough to pull it off. Or not release it to the world if it wasn't great.

A couple other builders have used a similar clamp, like Keith Lippy who used it on tandems for a few years. Some 'threadless' stems have been made that clamp the steerer that way too.

As far as holding the seatpost, Frejus did it similar for decades, no prob (but without the hole going through the TT; it passed underneath). Yes many Frejus frames used a slit lug, and the bolt was a fairly conventional pinchbolt, but others (I think it was cheaper models) had no slit and the bolt pushed on the post pretty much exactly how the Eisentraut does.

I'm not a fan of "pusher" bolts like this in general; I think it's inelegant engineering compared to a "pull" type pinchbolt. Cinelli 1R stem is an example. They have many fans but everyone will admit their reliability record is poor, with bars slipping, internal parts cracking etc, and they're not even particularly lightweight. It's just a cool look. That's how I feel about this 'Traut — cool looking, but not my cuppa tea in engineering terms. Even Albert soon abandoned it, going back to pinchbolts.

Mark B

Last edited by bulgie; 07-27-22 at 05:22 PM.
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Old 07-27-22, 06:00 PM
  #134  
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Dave Moulton Custom Touring
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Old 07-28-22, 09:18 AM
  #135  
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Old 07-28-22, 09:36 AM
  #136  
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1987 Fiorini

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Old 07-28-22, 10:51 AM
  #137  
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Old 07-28-22, 01:45 PM
  #138  
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None of these are mine - I wish - was just admiring these a week or so ago. Made by - Kelly Bedford - former Serotta Builder










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Old 07-28-22, 01:56 PM
  #139  
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Old 07-28-22, 02:14 PM
  #140  
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Old 07-28-22, 05:45 PM
  #141  
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Old 07-29-22, 10:17 AM
  #142  
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Ago15 Dude Not seeing the lugs in your photos
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Old 07-29-22, 04:01 PM
  #143  
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Originally Posted by smd4
How does the brake cable get past (through) the seatpost?
Originally Posted by P!N20
Magnets.


It's either evil black magic from the deh-veel, or there are two vertical slots cut in the seatpost.

But my guess is the deh-veel.
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Old 07-30-22, 12:36 PM
  #144  
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Carabela


Bottecchia

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Old 08-01-22, 08:20 AM
  #145  
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Bottecchia




Pinarello Montello, Simple and smooth




Tommasini Tecno




Tommasini Sintesi,
On the Tommasinis, I like how they incorporated the "T" into the tip of the lug.
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Old 08-01-22, 02:00 PM
  #146  
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The only photo I had handy - my Nobilette:

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Old 08-01-22, 06:28 PM
  #147  
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Originally Posted by SuperLJ
The only photo I had handy - my Nobilette:
......
Mark Nobilette doesn't get a lot of discussion here, if my memory is to be trusted, so this seems like a good reason/excuse to post some pics of a Nobilette frame from the 2009 NAHBS in Indianapolis...







all in all, a pretty cool frame!

Steve in Peoria
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Old 08-02-22, 12:48 AM
  #148  
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Originally Posted by steelbikeguy
Mark Nobilette doesn't get a lot of discussion here …
Not nearly enough, I think.

Someone once said that Mark has the "highest ratio of competence to humility" of any professional that they had ever met. I couldn’t agree more. Here’s a photo of the seat cluster on his personal bike:


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Old 08-02-22, 02:22 PM
  #149  
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Nice and slim 12mm just under the slanted part



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Old 08-02-22, 03:59 PM
  #150  
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Chapman


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