We've been riding the FSA OS-99 stem for a while, and we've been loving it. But when we found the FSA OS-99 CSI Carbon stem, well...it was time for an upgrade. FSA basically put a carbon wrapper on what is arguable one of the best stems on the market, but it's not just for looks. The carbon helps to stiffen up the stem and make it a little beefier for bigger riders or those who tend to torque the bars a little more.
Carbon Structural Integration (CSI) technology helps to stiffen up the stem and add durability
Crazy light at just 118 grams for a 110mm
Aluminum core helps resolve carbon fatigue
Carbon faceplate and titanium hardware help keep the weight down even more