Fsa K Force Os 99 Csi 31.8 Clamp Stem Black

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  • $322.99
  • Regular price $339.99
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The K-Force OS-99 CSI stem is 3-D forged and CNC machined from AL2014. Then it’s combined with a carbon structure using our CSI (Carbon Structural Integration) technology. CSI is a process that permanently bonds carbon to alloy to create a true hybrid product, with many of the benefits of aluminum and carbon. The final details reduce the OS-99 stems weight by using a 4-bolt sculpted AL2014 alloy/carbon faceplate and titanium hardware.



  • 3D forged and CNC machined from AL2014

  • Carbon Structural Integration Technology

  • 41mm fork clamp stack height

  • UD Carbon Finish

  • 41mm Clamp Stack Height

  • Weight 125 grams (100mm)


*Subject to availability. Specifications subject to change without notice.