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  1. #1
    Junior Member cboyne's Avatar
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    105 dual control shift levers with old ISO 25.4 clamp diameter bars

    I am building up a SOMA Smoothie and am thinking Shimano 105 groupset. I am not a big fan of the modern over-sized bars- I have never felt comfortable with them. So I would like to use older style 24=5.4 ISO drop bars.

    Will I be able to use modern Shimano 105 dual shift/brake levers with these narrower diameter bars?

  2. #2
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    i do not see why not... just tighten the bolts on the levers. I went with the thicker bars/ultegra build on my touring bike and that was on a vintage road frame.

    just make sure your mechs are the right diamater to fit around the tubing of the frame

  3. #3
    L-I-V-I-N dtrain's Avatar
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    The 'modern' over-sized bars are thicker at the stem clamp...but taper in such a way that they aren't really much different where the levers clamp. I run 26.0mm on my steel bike that has a 1" threadless headset (and skinny tubes). Just visually works better than a 31.8 would (IMO). My carbon bike has 1-1/8".
    Last edited by dtrain; 05-25-14 at 10:48 AM.
    "The older you do get, the more rules they're gonna try to get you to follow. You just gotta keep livin', man, L-I-V-I-N." - Wooderson

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    Junior Member cboyne's Avatar
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    Thank-you for the responses. So the claps on the brake/shifter levers can be tightened enough to fit narrower diameter bars? You don't have to order special levers with a different clamp diameter or something like that?

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    L-I-V-I-N dtrain's Avatar
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    Quote Originally Posted by cboyne View Post
    Thank-you for the responses. So the claps on the brake/shifter levers can be tightened enough to fit narrower diameter bars? You don't have to order special levers with a different clamp diameter or something like that?
    I think it'll be fine. I don't think you need to special order.
    "The older you do get, the more rules they're gonna try to get you to follow. You just gotta keep livin', man, L-I-V-I-N." - Wooderson

    '14 carbon Synapse - '12 CAAD 10 5 - '99 Gary Fisher Big Sur

  6. #6
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    Quote Originally Posted by cboyne View Post
    Thank-you for the responses. So the claps on the brake/shifter levers can be tightened enough to fit narrower diameter bars? You don't have to order special levers with a different clamp diameter or something like that?
    not that i know of... worst case scenario you can add/make shims by simply taping the bar to thicken it

  7. #7
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    Beyond the center of the bar I have never noticed it being oversized.
    Robert

    My hero: "Tar-Baby ain't sayin' nuthin'..." (Joel Chandler Harris, Uncle Remus")

  8. #8
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    AFAIK there is a "stem clamp diameter" and there is a diameter for everything else. "everything else" hasn't changed over the years. "stem clamp diameter"'s have been on the increase though. like i say AFAIK.

    wiki has a lot of info on it.

  9. #9
    Senior Member Trucker Dan's Avatar
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    The diameter of the bars where the shifters clamp on is the same on 25.4, 26, and 31.8 bars.

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