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Pretty SunTour XC stem canít support drop handlebars

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Pretty SunTour XC stem canít support drop handlebars

Old 05-02-18, 08:36 AM
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masi61
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Pretty SunTour XC stem canít support drop handlebars

I am making a drop bar commuter road bike out of a Trek Multitrack. The SunTour stem has a nice look to it with like a 30 degree upward rise stem. This stem is designed for 25.4 straight bars. It appears to be incompatible with drop bars. The instruction manual says the stem arrives as opened up as it can be & to not remove the bolts. The Salsa ergo bars (25.8 mm) that I was trying to mount did not get past the first turn.

Can anyone think of a road handlebar with more gradual bends that I might be able to mount on this pretty (but surprisingly heavy) stem?
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Old 05-02-18, 08:49 AM
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Easy solution would be to use a cromo MTB stem and open it up to navigate the bar through.
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Old 05-02-18, 08:53 AM
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Originally Posted by masi61 View Post
The Salsa ergo bars (25.8 mm) that I was trying to mount did not get past the first turn.
25.8? Is that some newfangled CF handlebar? There are many thing sin this world I have never heard of, and this is one of them.

Are you sure that wasn't meant to use an Italian-standard 26.0 handlebar clamp?
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Old 05-02-18, 09:00 AM
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Originally Posted by 3speedslow View Post
Easy solution would be to use a cromo MTB stem and open it up to navigate the bar through.
like I said - this is a very pretty stem, my desire is to find some drop bars that will work with this stem.
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Old 05-02-18, 09:02 AM
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Originally Posted by jimmuller View Post
25.8? Is that some newfangled CF handlebar? There are many thing sin this world I have never heard of, and this is one of them.

Are you sure that wasn't meant to use an Italian-standard 26.0 handlebar clamp?
I believe that Salsa bars are 25.8 to work with either 25.4 or 26.0 stems. This might only work for chromoly type stems or removeable faceplate stems though.
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Old 05-02-18, 09:21 AM
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...find a source for used stuff, like a co-op and then look at all the old Asian bars that are hanging around.
You should find some 25.4 drops, although most of them are pretty narrow by today's user standards.
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Old 05-02-18, 09:22 AM
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With experimentation you may find a bar that works but it will have a much deeper drop than the compact bars that you have. Your local bike shop or co-op should have some bars you can try. You may also find some older steel drop bars that will work: They tended to have a smaller diameter outside of the area where the stem clamps on.
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Old 05-02-18, 09:30 AM
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https://www.ebay.com/b/25-4-mm-Drop-...817/bn_1984342
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Old 05-02-18, 10:02 AM
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I spose you could sand out the clamp area. I’ve considered doing this to a beat up MTS-100 stem. Just because I think it would look cute.
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Old 05-02-18, 10:36 AM
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yeah that Nitto one would be great if it would fit.
iíve got some old Schwinn LeTour 25.4 bars (I think) that are 25.4 that iíll Try a test fit on. It would be a shame not to use that XC stem. The Trek has a long top tube - apparently it was designed for flat bars.
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Old 05-02-18, 02:19 PM
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25.8mm was a TTT clamp size, was considered analogous to 26.0 in every shop situation I can remember.

One can put an Allen key into the slot and then twist for a bit of expansion of the clamp, but too much force could weaken the stem.

Here is a picture showing said Allen key in place as I reamed out a 25.4mm stem for a 26.0mm handlebar. Note that this stem has a lot of meat in the clamp area (it's even available already sized for 26.0mm).
Also note that this sort of reaming procedure is self-aligning, and that these Origin-8 (Kalloy) stems are carefully sized to just slip into a French steer tube, even as they measure appreciably larger in quill diameter than any real French-sized stem from back in the day.



...with logo polished off and installed on a 26.0mm handlebar:

Last edited by dddd; 05-02-18 at 02:29 PM.
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Old 05-02-18, 02:27 PM
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Cinelli added a mm to an inchtube standard, for their bars for a long time ..26.4,
then fell back with the rest only adding 0.6mm.
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Old 05-02-18, 07:26 PM
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Originally Posted by masi61 View Post
This stem is designed for 25.4 straight bars. It appears to be incompatible with drop bars. The instruction manual says the stem arrives as opened up as it can be & to not remove the bolts. The Salsa ergo bars (25.8 mm) that I was trying to mount did not get past the first turn.
First things first: Don't try to install 25.8 mm bars in a 25.4 mm stem. They're incompatible.

As @dddd mentioned above, 25.8 mm bars are effectively 26.0 in my experience. I've purchased a few sets of Deda Speciale 26 handlebars in the past few years and the silkscreening on the bar says 25.8.

Originally Posted by masi61 View Post
Can anyone think of a road handlebar with more gradual bends that I might be able to mount on this pretty (but surprisingly heavy) stem?
In my experience, bars with gradual, traditional curves are easier to thread through stems than compact/anatomic bars. The Deda Speciale I mentioned above is an inexpensive drop bar with traditional curves, but I don't think it comes in a 25.4 size. The Nitto Classic Road Bar does, though.
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Old 05-03-18, 01:06 AM
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To answer the original question, your best bet is deep drop like Brent said, and non-ergo style. A "criterium" style bar will help when you get to the second bend. But still you may not make it if the stem is not shaped to navigate the bend radii of drop bars. Clamp diameter is irrelevant if the stem never makes it past the hook.
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