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  1. #1
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    26.0 handlebars in a 25.4 clamp... safe? stupid?

    So im continuing my first build... I got my hands on a decent quill, but its clamp size is 25.4. If I was throwing drop bars on this bike, that'd be no prob, but I want to put cowhorns on there, and Im haveing trouble locating those bars with a 25.4 diameter. Is it plausible to stick 26.0mm bars in a 25.4 clamp? Also, maybe someone knows where I can get a hold of some 25.4 cowhorns... maybe...

    Anyways, yall have been more than helpfull in this build so far (especially on saving me a load o cash with those ideas for homemade tools). As always, all your help is appreciated guys.. eventually Ill get this thing built...lol.

    -Seth

  2. #2
    Sometimes knows stuff. rmfnla's Avatar
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    Depends on the quill.

    I have a cro-mo Ritchey Force (made by Nitto) that I wouldn't hesitate to use for this since steel can handle the deformation that would occur.

    I wouldn't be comforable doing it with an Al part.
    Today, I believe my jurisdiction ends here...

  3. #3
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    so a steel handebar is alright? cool man, thanks.

  4. #4
    me have long head tube TallRider's Avatar
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    25.4mm bullhorn bars are available, but not as common.
    I wouldn't recommend putting a 26.0mm bar in a 25.4mm clamp unless it's a 2-piece separate-faceplate clamp design, which is more forgiving.
    Aluminum bars can get crimped doing this, while steel bars may cause the stem clamp to deform. You can get 26.0mm quill stems easily enough on eBay if you know the dimensions that you want.

  5. #5
    we are 138 Philatio's Avatar
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    Quote Originally Posted by ElSetho
    so a steel handebar is alright? cool man, thanks.
    he was refering to a steel stem, not handlebar.

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    ohhh... alright.

    Do any of yall know where to find a 25.4mm bullhorn? I was looking and cant seem to find any. Again guys, thanks.

    -Seth

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    Why can't you just sand the bar down a bit?
    Cause the more cyclists notice me the more I Love myself.
    Cause the more cyclists notice me the more I Love myself.

  8. #8
    Senior Member freeranger's Avatar
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    Someone correct me if I'm wrong here, but aren't there 25.4mm to an inch? So the 26mm bar is .6mm larger than the 25.4. So, .6mm/25.4mm= .02 inches. 2/100 of an inch does not seem a whole lot to me. Are mfg.tolerances that close?

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    Hey, not sure if anyone cares...

    I found a 25.4 bullhorn from Soma Fabrications... took me calling around, but I figured it out. Thanks again for all the help guys.

    -Seth

  10. #10
    me have long head tube TallRider's Avatar
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    Quote Originally Posted by freeranger
    Someone correct me if I'm wrong here, but aren't there 25.4mm to an inch? So the 26mm bar is .6mm larger than the 25.4. So, .6mm/25.4mm= .02 inches. 2/100 of an inch does not seem a whole lot to me. Are mfg.tolerances that close?
    Yes, it's small, but also it does actually matter. A 25.4mm bar won't fit cleanly or snugly in a 26.0mm clamp.

    Quote Originally Posted by sunofsand
    Why can't you just sand the bar down a bit?
    You could. But I wouldn't trust a bar to which this had been done, especially if it were a bulged-section bar. A sleeved-construction bar, perhaps. Generally not smart though - these things are built with pretty careful tolerances, and sanding usually doesn't equally remove material all the way around the bar.

    To the OP: glad you found a 25.4mm bullhorn bar.

  11. #11
    cs1
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    Quote Originally Posted by freeranger
    Someone correct me if I'm wrong here, but aren't there 25.4mm to an inch? So the 26mm bar is .6mm larger than the 25.4. So, .6mm/25.4mm= .02 inches. 2/100 of an inch does not seem a whole lot to me. Are mfg.tolerances that close?

    Actually, they are. There are so many 26mm quill stems it aint funny. You should be able to score one on ebay or Nashbar in the $20 range. Good luck

    Tim
    1999 Waterford RSE-11, 1995 Waterford 1200, 1989 Specialized Rockhopper Comp
    1989 Raleigh Technium, 1989 Schwinn Traveler, 1986 Specialized Rockhopper
    1984 Specialized Stumpjumper, 1986 Specialized Stumpjumper and just way too many projects to list.

  12. #12
    I Fold bykerouac's Avatar
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    Quote Originally Posted by sunofsand
    Why can't you just sand the bar down a bit?
    Please don't do this. Faceplant in the making.

  13. #13
    Sometimes knows stuff. rmfnla's Avatar
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    Quote Originally Posted by freeranger
    Someone correct me if I'm wrong here, but aren't there 25.4mm to an inch? So the 26mm bar is .6mm larger than the 25.4. So, .6mm/25.4mm= .02 inches. 2/100 of an inch does not seem a whole lot to me. Are mfg.tolerances that close?
    Yeah, it's not much but aluminum just doesn't respond well to that kind of deformation. Like I said in my first response, if it was a steel stem I wouldn't worry about it.

    It is possible to file/sand/machine an aluminum stem to fit this bar, but if the OP was up to that kind of operation he wouldn't have asked the questions he did in the first place.


    And, as cs1 said there is no shortage of 26.0 mm stems out there, so why take the chance?
    Today, I believe my jurisdiction ends here...

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