FSA OS-99 CSI Stem

FSA's K-Force OS-99 CSI is 3-D forged and CNC machined from AL2014 before a uni-directional (UD) carbon weave skin is applied through the Carbon Structural Integration (CSI) process. To further reduce weight the OS-99 uses a 4-bolt sculpted ...(Read More)

FSA OS-99 CSI Stem
$189.99
Clamp Diameter
31.8mm
Color
Black
Rise
Steerer Diameter
1-1/4-inch and 1-1/8-inch
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Details

FSA's K-Force OS-99 CSI is 3-D forged and CNC machined from AL2014 before a uni-directional (UD) carbon weave skin is applied through the Carbon Structural Integration (CSI) process. To further reduce weight the OS-99 uses a 4-bolt sculpted AL2014 alloy/carbon faceplate and titanium hardware. 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.

- Stack Height: 41mm
- Weight: 126g (100mm)

Stem angle and length measurement

Stem angle is one of the factors that determines handlebar height. A listed angle of 0 degrees actually provides a rise that is dependent on your bike’s head angle (see image).

Stem length is measured along the side of the stem from the center of the steerer to the center of the handlebar clamp (see diagram). Keep in mind that as a stem provides more rise, its effective length decreases. In the example above, if the +17 degree stem measures 135mm, it actually extends 108mm parallel to the ground.

Part Numbers

Option UPC MPN
31.8mm / Black / 90mm / 6° / 1-1/4-inch and 1-1/8-inch 00400310062024 175-0316BKG
31.8mm / Black / 110mm / 6° / 1-1/4-inch and 1-1/8-inch 00400310062048 175-0318BKG
31.8mm / Black / 120mm / 6° / 1-1/4-inch and 1-1/8-inch 00400310062055 175-0319BKG