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  1. #1
    is slower than you Peek the Geek's Avatar
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    Riding with the wrong stem clamp size bad?

    Hello Bike Forumites. I'm considering going with a shorter stem on my road bike, but want to try before I buy. I've got a shorter stem, but it came off of one of my mountain bikes, and the bar clamp size is 25.4mm.

    So the question is, will I do any damage to the bike (or myself) by temporarily using the 25.4mm stem on my 26.0mm bars?

    Thanks.
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  2. #2
    DEADBEEF khuon's Avatar
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    1999 K2 OzM 2001 Aegis Aro Svelte OCP Club Member
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  3. #3
    is slower than you Peek the Geek's Avatar
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    Quote Originally Posted by khuon
    ...
    So the 8-Ball is saying I shouldn't do it. What kind of damage would I do?
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  4. #4
    DEADBEEF khuon's Avatar
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    Crushed bar. Many a handlebar has failed at the stem-clamp area even when the sizes are matched. The difference in curvature from using an undersized clamp will most likely cause a high stress concentration. If you're running an older bar or a steel bar then you'll probably be okay but if it's a semi-modern aluminum bar or CF bar then I would strongly urge you to reconsider such an action.
    1999 K2 OzM 2001 Aegis Aro Svelte OCP Club Member
    "Be liberal in what you accept, and conservative in what you send." -- Jon Postel, RFC1122

  5. #5
    MADE IN HONG KONG
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    I've got a similar situation, but I wouldn't do it (26.0 bar in a 25.4 stem)

    stress concentration due to point contact,
    plastic deformation, the smaller clamp will want to crush the bar
    It just does not fit!

    It is like a pair of shoes. If the shoe is slightly big, you can walk around in them and it should be ok,
    if you want a snug fit, wear a thicker pair of socks. If the shoe is slightly small, it will hurt...every moment!
    If you are not having any fun, it's all your fault

  6. #6
    is slower than you Peek the Geek's Avatar
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    Well poop.

    I'm glad I asked. Thanks.
    Proud supporter of the Chippewa Off-Road Bike Association (CORBA)
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