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Will a 26mm Handlebar work with 25.4mm Stem?

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Will a 26mm Handlebar work with 25.4mm Stem?

Old 02-18-10, 02:30 PM
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Will a 26mm Handlebar work with 25.4mm Stem?

Will a 26mm Handlebar work with 25.4mm Stem?
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Old 02-18-10, 02:36 PM
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nope
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Old 02-18-10, 02:51 PM
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Yup, just did it on my Voyaguer 11.8 build.
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Old 02-18-10, 03:04 PM
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The best thing that you can do if you insist on trying this mismatch is to file a chamfer along all four edges of the face plate and stem, about 1-1.5mm in width. What that does is eliminate the pinch points that can occur along the edges.

Last edited by DaveSSS; 02-19-10 at 10:39 AM.
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Old 02-18-10, 03:41 PM
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nice idea, poor execution
 
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Originally Posted by lane
nope
I thought this thread was over. I'll quote it again.

Originally Posted by lane
nope
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Old 02-18-10, 09:00 PM
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Originally Posted by theschwinnman
Yup, just did it on my Voyaguer 11.8 build.
Let us know how it works out in 10,000 miles or so. I'm glad it's your bike, not mine.

The real question isn't CAN it be made to work (the answer is yes), but SHOULD you do it and that answer was given very succinctly in the second post. NOPE.
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Old 02-18-10, 09:23 PM
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I did not force it in either. I just pried the bar clamp ever so slightly open to aid in the removal of the old bars, then slid the new set in, and tightened the clamp bolt, no problems.
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Old 02-18-10, 09:27 PM
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Originally Posted by theschwinnman
I did not force it in either. I just pried the bar clamp ever so slightly open to aid in the removal of the old bars, then slid the new set in, and tightened the clamp bolt, no problems.
I am so glad you don't actually repair bikes for other people.
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Old 02-18-10, 09:35 PM
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well, I just broke out the calipers, the new bars are 25.4, I feel like a moron now. Disregard all my replies on this topic.

Operator, I do repair bikes for other people, I routinely volunteer at a non-profit "bike shop".
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Old 02-18-10, 09:38 PM
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Originally Posted by theschwinnman
Operator, I do repair bikes for other people, I routinely volunteer at a non-profit "bike shop".
That's pretty damn frightening.
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Old 02-18-10, 09:39 PM
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go to hell
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Old 02-18-10, 09:58 PM
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Originally Posted by oldbluebike
I hope attached to this post is a picture of a stem I have with a Cinelli 26 mm handle bar in it. It is a 90 mm Nitto stem designed for 25.4 mm handle bars. I have a 130 mm Cinelli stem and want to switch to the 90 mm Nitto because I do not like the 130 mm stem. The only one of the correct diameter that would fit my old frame I have was the Nitto, I purchased of of ebay. I have not ridden it yet but have ridden it on my trainer. It is very tight and does not seem to compress it in any strange way. I only work on my own bikes and have been having success for many years. Does this look bad???
We don't need a picture. The stem clamp diameter is non negotiable on quill stems. You have probably already damaged it even by trying to force it through and tightening the clamp bolt.
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Old 02-18-10, 10:00 PM
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What about to ream the stem a little bit?
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Old 02-18-10, 10:04 PM
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Originally Posted by ultraman6970
What about to ream the stem a little bit?
No.
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Old 02-18-10, 10:10 PM
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I have seen that done centuries ago, i even had stem combination like the OP in my track racing bike, stem which we reamed it a little bit, worked like a charm for more than 15 years, zero problems , i believe the sucker i sold the bike still has it from what i been told. Been here, been there, done this and done that...
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Old 02-18-10, 10:14 PM
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Originally Posted by ultraman6970
I have seen that done centuries ago, i even had stem combination like the OP in my track racing bike, stem which we reamed it a little bit, worked like a charm for more than 15 years, zero problems , i believe the sucker i sold the bike still has it from what i been told. Been here, been there, done this and done that...
Cool. You go ahead and offer that as a service to people now.
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Old 02-18-10, 10:19 PM
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Originally Posted by oldbluebike
Figured out how to add picture. I would think I would damage the handlebar stem before the handlebar itself. How much does a decent quality handle bar run? Something comparable to the Cinelli? Money is definitely an issue.
A standard AL drop bar will run from $20+. It's a new stem that you need anyways. You're looking for one with a 26.0 clamp diameter. Most modern road bars are going to be "oversized" 31.8.
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Old 02-18-10, 10:20 PM
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Thanks guys, i found a decently priced 26mm stem and bought it!
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Old 02-18-10, 10:24 PM
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Originally Posted by oldbluebike
How much does a decent quality handle bar run? Something comparable to the Cinelli? Money is definitely an issue.
The Nittos are OK and some come in 25.4 (if you want one to fit a 25.4mm stem), such as this one:

https://www.velo-orange.com/niclba.html

Personally, having seen forged stems break from clamp-size mismatches, as well as bars that sheared, this is not something I would screw around with in the interest of saving money, saving weight, or sentimental attachment to an old classic bar or stem. Use stuff that fits eachother, is my advice.
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Old 02-18-10, 10:26 PM
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Originally Posted by mechBgon
The Nittos are OK and some come in 25.4 (if you want one to fit a 25.4mm stem), such as this one:

https://www.velo-orange.com/niclba.html

Personally, having seen forged stems break from clamp-size mismatches, as well as bars that sheared, this is not something I would screw around with in the interest of saving money, saving weight, or sentimental attachment to an old classic bar or stem. Use stuff that fits eachother, is my advice.
The hack mechanics on this thread would disagree with you.
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Old 02-18-10, 10:41 PM
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Originally Posted by operator
The hack mechanics on this thread would disagree with you.
I noticed they're a bit feisty on this topic. In my mind, bar/stem mismatch is like riding against traffic: yeah, there are survivors, but it's still not a good idea.
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Old 02-19-10, 01:05 AM
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I have an unlabeled stem (threadless style with removable faceplate) and don't know whether it is 25.4 or 26.0 mm (I got it off of someone with a bunch of other parts, and I wasn't very interested in the stem at the time). I have some calipers, but depending on how tight I make the bolts it can measure 25.4 or 26.0, so how do I tell the difference? It's also not labeled with anything that I can search for online.
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Old 02-19-10, 06:42 AM
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Neither stems nor bars are that expensive that you couldn't replace one or the other. Or trade.
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Old 02-19-10, 09:09 AM
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Originally Posted by ultraman6970
I have seen that done centuries ago, i even had stem combination like the OP in my track racing bike, stem which we reamed it a little bit, worked like a charm for more than 15 years, zero problems , i believe the sucker i sold the bike still has it from what i been told. Been here, been there, done this and done that...
A lot of track stems and bars are steel, not Al, and are stronger and more tolerant of both material removal and size mismatches. It's still a poor idea with Al road bars and stems.
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Old 02-19-10, 09:37 AM
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Originally Posted by Chris_W
I have an unlabeled stem (threadless style with removable faceplate) and don't know whether it is 25.4 or 26.0 mm (I got it off of someone with a bunch of other parts, and I wasn't very interested in the stem at the time). I have some calipers, but depending on how tight I make the bolts it can measure 25.4 or 26.0, so how do I tell the difference? It's also not labeled with anything that I can search for online.
Did you measure multiple positions? I have a feeling if you rotated the calipers about 15 degrees between 5 or 6 measurements, one of those settings will be more inconsistent than the other. Remember that the reason you don't want to vary or mismatch is because the clamp is only safe if it grabs all the way around, and not just at a few specific points. Back when I was young and stupid, I put a 26.0 bar in a 25.4 stem. When I pulled it out a few months later, the bar had been crushed into a tear drop shape (single bolt quill stem). Realizing that I value my teeth, I tossed the bar and got a matching set.
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