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  1. #1
    Member
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    Sep 2008
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    Santa Cruz, CA
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    Trek 730 (1983), Electra Townie, Gary Fisher Tassajara
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    Newbie needs help with quill stem

    I want to tweak the fit of my '83 Trek 730 slightly by replacing the original stem with one that's shorter in the horizontal dimension, to bring the bars a little closer to the seat. I want a stem that looks similar to what I have now, just for aesthetics. I'm pretty sure it's a 1" quill. I measured the thickness of the bars at the center at 25.4mm. The horizontal length of my existing stem seems to be about 110mm (center to center). On eBay I see some Origin 8 stems that seem right, but there's one dimension I don't understand. Can someone tell me what part of the stem has a dimension of 22.2mm?

    Copied from eBay description:
    # FORGED ALLOY POLISHED
    # 60MM CENTER TO CENTER
    # -17 DEGREE ANGLE
    # 22.2 x 180MM LENGTH QUILL
    # 25.4MM CLAMP
    # 1" QUILL

    Thanks,
    Dan

  2. #2
    Senior Member
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    Dec 2005
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    22.2mm = inside diameter of the steerer tube our outside diameter of the stem shaft. That's the standard size and should fit your Trek (many French bikes take a slightly smaller--22.0mm--stem). I'm not sure how Origin8 measures height (the 180mm dimension), but it's likely from the minimum insertion line to the top.

    Neal

  3. #3
    Member
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    Thanks Neil. That answers my question enough to go ahead and make the purchase. Now, just to satisfy my curiosity, to what does the 1" dimension refer? I had assumed that was the inside diameter of the steerer tube but now I know better. Maybe it's the outside dimension?
    Thanks,
    Dan

  4. #4
    Senior Member CACycling's Avatar
    Join Date
    Feb 2008
    Location
    Oxnard, CA
    My Bikes
    '08 Fuji Roubaix RC; '07 Schwinn Le Tour GS; '92 Diamond Back Ascent EX
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    The 1" is the OD of the steerer.

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