is there such thing as a .833 techmonic (forgive my spelling) stem? I am rebuilding my voyageur s/p and would like to raise the bars a bit. has anyone filed one down to 21.1?

I know that that I could replace the fork with a regular 1" fork, but this one is gorgeous chrome, and I would hate not to use it.

I think on a stem it might be possible, but I think I would take it to a machine shop and have it turned down. 1.1 mm does not sound like it would be much fun to do by hand.

Technomic? No. You must be under 40, eh? 0.833 (same as 21.1) was an incredibly common size in the 70s and 80s, used on some road bikes, early mountain bikes, most vintage American bikes (anything with a one-piece crank will probably have this size stem), and all BMX stems. Save your nice Technomic from destruction, patiently look around on ebay and ask the sellers of vintage parts if they have any long 21.1 road bike stems in the back room. Early Nishiki Internationals used this size, for instance, so there's definitely some high-end stems collecting dust .

I don't know what a techmonic stem is, but funny you ask about .833. I bought an old road bike a few days ago for the sole purpose of using its stem. I took it off and installed it on my other bike, only to see it wobbling around. Stupid thing was .833, not 1".

made me sad

I don't think you'll find many .833 stems with the looong (tall) quill that the Technomic has, but that would be preferable to modifying your stem. I have turned a stem in a lathe and reduced the diameter, but the shape of the piece makes it a difficult job: the angled portion threatens to smack your hands or interfere with the cutting tool, and you have to hand-finish the end of the quill that you had clamped in the chuck. But it insures that you get a more accurate, and more even, diameter...not a job for most people who don't have a lathe to take on, I think, and sanding off that much material would get *really* tiring.

is the stem steel? and how much did you pay for that bike? cause I'm looking for a 0.833" stem

cdr

There is/was such a thing as a 21.1mm (.833") Technomic. I have one labeled as such on the bottom of the quill as with normal Nitto stems, so I'm pretty sure it is authentic. I've only ever seen the one that I have though. I can post a picture or two tonight if anyone is interested.

Here you go:

https://shop.vendio.com/benscycle/ite...536/index.html

Dude! That's like having a private buyer! Hope you can use a 60mm reach, but what a great deal for those who can...THANKS, Colintdesign!

I think it'd be easier to get the steerer tube reamed by a machine shop than turning down the stem on a lathe.

I saw the 60mm at Ben's and man, that is just *too* short for me to use on my little project (a Takara road bike). For a while I used a different fork and that worked great really, but like the OP, the originaly fork is jut really, really nice. If the OP ends up swapping forks, it drops right it. No problem.

Have you actually checked the bike to know it needs 21.1 mm? I know you probably wouldn't be here asking if you hadn't, but I have to ask.

While most Schwinns did use them I know that some didn't, like my 1986 Voyageur, which uses a standard 1" quill stem.

In my case, it is because it is Columbus Tenax... From what I was told at the LBS, Columbus refused to use the non-standard steerer diameter that Schwinn usually used.

Of course, he also said that all Columbus framed Schwinns were US built, so I was a little skeptical because I checked the labels and my bike is Japanese built. Then I slid my Technomic into the steerer for a perfect fit...