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What are lugs/lugwork - Newbie Ques?(21 posts)

What are lugs/lugwork - Newbie Ques?t-moore
Mar 6, 2003 5:37 PM
I see these two words used quite often on the boards. I do not know exactly what, or what part of the bike they refer to....
re: What are lugs/lugwork - Newbie Ques?laffeaux
Mar 6, 2003 5:51 PM
Few bikes today are constructed with lugs, so there's a good bet that your bike has none.

The most common ways to join tubes today is welding - most frame are tig-welded. In the past frames were joined by placing the ends of the tubes into "lugs" and brazing the tube and lug together. See the pic below to see what lugs are.

The more detailed the lug, the more detailed the "lug work."

Tomorrow's lesson will be fillet brazed frames...
part 2laffeaux
Mar 6, 2003 5:59 PM
Maybe fillet brazed frames can't wait.

Definitions courtesy of Sheldon Brown.

Welding A process of joining similar metals by heating them so that they melt into one another.

Brazing Brazing is the joining of metal parts by melting a different metal (of lower melting point) which bonds the parts together. Typically brazing involves joining steel parts with molten brass. Soldering is a similar operation, using lower temperatures and different filler metals (with a lower melting point) In brazing and soldering, the filler metal penetrates inaccessible areas of the joint by capillary action.

Note: Lugged frames are brazed.

fillet brazing A process in which frame tubes are brazed directly to one another, without the use of lugs. The "fillet" (pronounced "fill-it") is the strip of brass melted along the seam to connect the steel parts. The fillet is usually filed smooth, so that the tubes seem to flow smoothly into one another with no sharp transitions.

Here's a pic of a fillet brazed tubeset.
Thanks for the quick primer...t-moore
Mar 6, 2003 6:12 PM
Who built the frame in the pic?StevieP
Mar 7, 2003 12:49 AM
Its a beauty.
Who built the frame in the pic?laffeaux
Mar 7, 2003 10:18 AM
The lugged frame pic was taken from Rivendell Bicycles:

The fillet brazed frame is an old Ritchey MTB that I used to own.
Ornate lugs and suchLone Gunman
Mar 6, 2003 6:53 PM
Taking the lug discussion a tiny step further, in the day of lugged frames, some lugs are chrome. The painted tubes flow into a chrome lug for a stunning "look", like Cinelli Super Corsa of today. Believe Tomassini still does some chromed lugs. Some of the lugs very ornate, almost a gothic look to them(Steelman frames maybe?), spearpoints and/or sharp french curves. Lastly, steel frames use external lugs.
Ornate lugs and suchbrian n
Mar 6, 2003 8:11 PM
the true definition of ornate lugs are hetchins. check it out:

-brian n
Or Richard MoonStevieP
Mar 7, 2003 12:48 AM
Boy I would love to own a Moon.
since you mentioned Gios ...tarwheel
Mar 7, 2003 5:52 AM
Not the fanciest lugs around, but not bad for a $550 frame ...
..but nicer than TIG'd AL that is for sure! nmSpunout
Mar 7, 2003 5:53 AM
nice BB, too ...tarwheel
Mar 7, 2003 6:02 AM
You just don't find details like this on a TIG frame
re: What are lugs/lugwork - Newbie Ques?Spunout
Mar 7, 2003 4:34 AM

Colnago MXL, Gios Compact Pro, still doing some nice lugwork. Many small builders (artisans) doing much more. more...Spunout
Mar 7, 2003 4:34 AM
More more more....:-) (please!) (nm)StevieP
Mar 7, 2003 5:04 AM
Mar 7, 2003 8:37 AM
Wow!Humma Hah
Mar 7, 2003 7:57 AM
Those are the prettiest I've EVER seen!

I gots a case of lug envy!
Wow!Rob Sal
Mar 7, 2003 12:29 PM
They certainly are the best looking lugs I have ever seen. I wonder how strong they are though, unless its a silver soldered or fillet brazed and then a cosmetic lug attached over the top.
Too bad Columbines are so bloody expensivekenyee
Mar 7, 2003 7:16 AM
They are works of art though...I love that astronomy one :-)
Sachs in okay, he is progressive.Spunout
Mar 7, 2003 5:17 AM
re: What are lugs/lugwork - Newbie Ques?bic
Mar 7, 2003 9:38 PM
Just makes me feel as old as I am. :(