FSA stem 'OS-99 CSI' with 31.8mm handlebar clamp diameter & 6° slope

Carbon supports aluminum - at an outstanding low weight.

This item is no longer being offered by the manufacturer
  • 3D forged
  • carbon coated
  • titanium bolts

Product information & technical details

Material: Aluminium, Carbon
Length: 80mm, 90mm
brand: FSA
Stem & handlebar clamp diameter: 31.8
Gear system: 9-speed
sprocket-/chain size: 1/2" x 11/128"
fork steerer size: 1 1/8"


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English reviews written for FSA OS-99 CSI stem black