Detail Images

  • FSA - OS-99 Stem - Black
  • FSA - OS-99 Stem - Red Graphic

Current Color

  • FSA - OS-99 Stem - Black
  • FSA - OS-99 Stem - Red Graphic

FSA OS-99 Stem

sale from $119.95 $179.9933% Off

Free 2-Day shipping on orders over $50*

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  • Select options
    • Black, 100mm
      sale $152.99
    • Black, 110mm
      sale $152.99
    • Black, 120mm
      sale $152.99
    • Black, 130mm
      sale $152.99
    • Black, 80mm
      sale $152.99
    • Red Graphic, 110mm
      sale $119.95
    • Red Graphic, 130mm
      sale $119.95
    • Red Graphic, 60mm
      sale $119.95
    • Red Graphic, 70mm
      sale $119.95
    • Red Graphic, 90mm
      sale $119.95

    Be the first to review


    Lighter and stronger than it should be.

    Let's get one thing out of the way—the OS-99 Road Stem is the lightest stem that FSA makes, and no, the "7050 aluminum body" isn't a typo. By using a proprietary 3D forging technique and special heat treatment ("witchcraft" is the technical name) FSA makes the OS-99 as strong as a heavyweight stem but as light as a part made of pure carbon fiber. To be fair, the faceplate is built partially from carbon, to achieve the perfect balance of strength and weight, and the unbreakable bolts have been forged from titanium, so the OS-99 isn't pure aluminum. The faceplate also has a serrated surface that will grip both carbon and aluminum bars, and a rise of +/- six degrees, depending on which way you set it up.

    • 7050 aluminum body
    • Titanium bolts
    • Alloy and carbon faceplate with serrated grip surface
    • 31.8mm clamp diameter
    • 1 1/8in steerer tube diameter
    • +/- 6 degree rise
    • Item #FSA000I

    Tech Specs

    [body] aluminum, [bolts] titanium, [faceplate] alloy/carbon
    6 deg
    Clamp Diameter
    31.8 mm
    Steer Tube Diameter
    1 1/8 in
    Bar Attachment
    Claimed Weight
    [90mm] 103 g
    Recommended Use

    Tech Specs

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    Unanswered Question

    hello, do you have actual weight on the...

    hello, do you have actual weight on the FSA OS-99 stem? And any other stem comparable to this one you'd recommend? thanks very much