FSA OS-99 CSI Carbon Stem

Item # YS-CSI

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$59.99
MSRP: $179.99
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FSA OS-99 CSI Carbon Stem
The FSA OS-99 CSI Carbon Stem is the perfect means to help lighten and stiffen your bike's cockpit. FSA truly pulled out all the stops with the utilization of their Carbon Structural Integration (CSI) technology, the fusion of carbon fiber and aluminum, in the construction of this stem. A structural outer layer of carbon fiber is wrapped around an aluminum core to not only increase stiffness but also create an elegant carbon aesthetic. Simply put, you've got a rock-solid platform that's featherweight to boot. You can perfectly dial in your position with the +/- 6-degree rise and its 31.8mm clamp diameter is compatible with a wide range of handlebars.
  • Carbon fiber/7050 aluminum construction provides stiffness and light weight
  • Carbon/alloy faceplate and titanium hardware further shave grams
  • 4-bolt faceplate evenly distributes pressure
  • UD carbon finish
  • +/- 6 degree rise
  • Fits 1-1/8" steerer tubes
  • Fits 31.8mm diameter handlebars
  • Weight: 126g (100mm)
FSA OS-99 CSI Carbon Stem
  • WEIGHT 126g
  • MATERIAL Carbon fiber weave/7050 aluminum
  • RISE +/- 6-degree
  • STEERER DIAMETER 1-1/8"
  • CLAMP DIAMETER 31.8mm
  • CLAMP HEIGHT 41mm
  • LENGTHS 80mm, 110mm, 120mm, 130mm
  • Rating 4.5

REVIEW SNAPSHOT®

by PowerReviews
FSA OS-99 CSI Carbon Stem
 
4.6

(based on 11 reviews)

100%

of respondents would recommend this to a friend.

Pros

  • Lightweight (9)
  • Durable (5)

Cons

No Cons

Best Uses

  • Road biking (10)
    • Reviewer Profile:
    • Avid cyclist (8)
    • Cycling Style:
    • Speed oriented (10)
    • Was this a gift?:
    • No (11)

Reviewed by 11 customers

Displaying reviews 1-10

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4.0

Not only good looking...

By Rench91

from Long Beach, CA

About Me Avid Cyclist

Verified Buyer

Pros

  • Durable
  • Lightweight

Cons

    Best Uses

    • Road Biking

    Comments about FSA OS-99 CSI Carbon Stem:

    +\- 6 degrees. Not too low and not too high. Position got dialed in right away no problem. FSA cockpit. "Very nice!"

    • Cycling Style:
    • Speed Oriented
    • Was this a gift?:
    • No

    Comment on this reviewHelp Icon

     
    5.0

    Great new carbon stem

    By Jthin01

    from West Chester, OH

    About Me Avid Cyclist

    Verified Buyer

    Pros

    • Durable
    • Easy To Install
    • Lightweight

    Cons

    • Na

    Best Uses

    • Commuting/City
    • Road Biking

    Comments about FSA OS-99 CSI Carbon Stem:

    Received stem in mail within few days of ordering. Very easy to install and exactly what I needed. A little extra length due to rider height and something a little lighter than original aluminum stem. Great purchase and looking forward to many miles of added comfort!

    • Cycling Style:
    • Speed Oriented
    • Was this a gift?:
    • No

    Comment on this reviewHelp Icon

    (0 of 1 customers found this review helpful)

     
    5.0

    Good looking carbon stem at a good looking price.

    By VaDave

    from Purcellville, VA

    About Me Avid Cyclist

    See all my reviews

    Verified Buyer

    Pros

    • Lightweight

    Cons

      Best Uses

      • Road Biking

      Comments about FSA OS-99 CSI Carbon Stem:

      This FSA carbon stem was a good looking upgrade to my bike. Take advantage of a 25% off sale and it gets even better looking.

      • Cycling Style:
      • Speed Oriented
      • Was this a gift?:
      • No

      Comment on this reviewHelp Icon

       
      5.0

      FSA OS-99 Carbon Stem

      By Kobe Axle

      from Canada

      About Me Avid Cyclist

      Verified Buyer

      Pros

      • Durable
      • Lightweight

      Cons

        Best Uses

        • Road Biking

        Comments about FSA OS-99 CSI Carbon Stem:

        I have these stems on all my bikes, road bikes, they work great and come in 130mm length which is what I currently use.

        • Cycling Style:
        • Speed Oriented
        • Was this a gift?:
        • No

        Comment on this reviewHelp Icon

         
        5.0

        Recommended buy

        By Masput

        from LA

        About Me Avid Cyclist

        Verified Buyer

        Pros

        • Lightweight

        Cons

          Best Uses

          • Road Biking

          Comments about FSA OS-99 CSI Carbon Stem:

          Slapped on to my Kestrel Talon compliments the carbon frame

          • Cycling Style:
          • Speed Oriented
          • Was this a gift?:
          • No

          Comment on this reviewHelp Icon

          (1 of 1 customers found this review helpful)

           
          5.0

          Always great bling

          By R. Lara

          from NYC

          About Me Avid Cyclist

          Verified Buyer

          Pros

          • Durable
          • Lightweight
          • Versatile

          Cons

            Best Uses

            • Road Biking

            Comments about FSA OS-99 CSI Carbon Stem:

            Great looking stem. Must be paired with the matching seatpost for bling profile shots.

            • Cycling Style:
            • Speed Oriented
            • Was this a gift?:
            • No

            Comment on this reviewHelp Icon

            (1 of 1 customers found this review helpful)

             
            5.0

            Beautiful stem

            By John

            from Jersey/Florida

            About Me Competitive Cyclist

            See all my reviews

            Verified Buyer

            Pros

              Cons

                Best Uses

                • Road Biking

                Comments about FSA OS-99 CSI Carbon Stem:

                Beautiful lightweight stem with lovely titanium hardware. I couldn't be more pleased. Great price especially when discount is applied.

                • Cycling Style:
                • Speed Oriented
                • Was this a gift?:
                • No

                Comment on this reviewHelp Icon

                (1 of 1 customers found this review helpful)

                 
                5.0

                Beautiful stem

                By Jbhoove

                from Jersey/Florida

                About Me Avid Cyclist

                Pros

                • Lightweight

                Cons

                  Best Uses

                  • Mountain Biking
                  • Road Biking

                  Comments about FSA OS-99 CSI Carbon Stem:

                  Purchased stem for mail order bike with too short stem. Delighted with the FSA. The stem and titanium hardware are beautiful and light. I'm tempted to purchase another for my other bike just because it's so pretty.

                  • Cycling Style:
                  • Speed Oriented
                  • Was this a gift?:
                  • No

                  Comment on this reviewHelp Icon

                  (0 of 1 customers found this review helpful)

                   
                  3.0

                  It is good enough for me

                  By Junior

                  from Mackinaw city Michigan

                  Verified Buyer

                  Pros

                  • Lightweight
                  • This Product Is Good Enou

                  Cons

                    Best Uses

                      Comments about FSA OS-99 CSI Carbon Stem:

                      Am pleased with this product

                      • Was this a gift?:
                      • No

                      Comment on this reviewHelp Icon

                       
                      5.0

                      Great product from FSA

                      By Eddieray

                      from San Diego,Ca

                      About Me Competitive Cyclist

                      Verified Buyer

                      Pros

                      • Durable
                      • Lightweight

                      Cons

                        Best Uses

                        • Mountain Biking
                        • Road Biking

                        Comments about FSA OS-99 CSI Carbon Stem:

                        Needed a longer stem and this fit the bill and at a great price

                        • Cycling Style:
                        • Speed Oriented
                        • Was this a gift?:
                        • No

                        Comment on this reviewHelp Icon

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