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  1. #1
    Chainstay Brake Mafia
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    what is up with the size of this cinelli stem and handle bars?

    I got a cinelli handlebar and stem with a centurion frame i bought recently. it's the older threaded kind with the conical nut that goes up into the stem and makes it expand, not the kind with the wedge shaped nut

    I've noticed two things, both concerning the tube diameters.

    1st: the stem diameter seems like it is slightly oversize and doesn't fit in a standard 1" stem. well, not easily at least. I spent over an hour removing this stem because it was jammed in so tightly.. i suspect a hammer was involved in the original installation.

    2nd: the diameter of the handlebars are also slightly oversized too.. that's actually why i decided to remove the handlebars: because i couldn't fit my shimano brakes on them.

    I looked on sheldon's site and it said the clamp area is bigger on italian and some cinelli bars.. but why is everything seem like it's the "wrong" size? do they have different rulers in italy?
    1986 Diamondback Apex ~ 1988 Diamondback Ascent EX ~ 1989 Jamis Dakar ~ 1989 Specialized Stumpjumper Comp
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  2. #2
    Senior Member
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    frantik, With multiple Cinelli equipped bikes over the years I've never had a problem with Cinelli quill stems fitment into the steerer tube, perhaps someone else can help there. Cinelli may've been the last handlebar brand to have a 26.4 mm clamping diameter, but I've run Shimano integrated and non integrated levers without issue.

    Brad

  3. #3
    coprolite fietsbob's Avatar
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    Nope, the bar clamp, for Cinelli is road standard older ones a full mm larger than an inch
    26.4 versus 25.4, current road is 26.0, there are specialty Shims made by Nitto,
    to put a 25.4 bar in a 26.0 stem,its 0,3mm thick,
    26.4 > 25.4 means you need a 0.5mm shim..

    Newer Cinelli re tooled to 26.0mm bar clamp.

  4. #4
    Chainstay Brake Mafia
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    yeah i know the clamp is supposed to be a different size but the whole thing seems slightly oversized.. i dunno why
    1986 Diamondback Apex ~ 1988 Diamondback Ascent EX ~ 1989 Jamis Dakar ~ 1989 Specialized Stumpjumper Comp
    1993 Trek 8300 Composite ~ 1993 Diamondback Axis Team Titanium ~ 1995 Diamondback Apex

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  5. #5
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    grease those brake lever clamps and expand them as much as possible and they'll slip on.

    if you're having trouble getting the stem in and out of the steerer tube it could be the older conical nut design. i had one 3ttt stem that was easy to install but difficult to pull out. even after knocking the bolt head down with a block of wood and hammer as you sometimes need to do to get it free. maybe the slotted metal at the bottom had gotten a little too expanded from the conical nut and stayed slightly deformed at a larger diameter?

  6. #6
    Chainstay Brake Mafia
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    yeah im just gonna buy a new set of handlebars, but i was wondering why these ones seemed so wrong
    1986 Diamondback Apex ~ 1988 Diamondback Ascent EX ~ 1989 Jamis Dakar ~ 1989 Specialized Stumpjumper Comp
    1993 Trek 8300 Composite ~ 1993 Diamondback Axis Team Titanium ~ 1995 Diamondback Apex

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