FSA Os-99 Csi

The carbon wrap adds structural stiffness to the aluminum core, allowing the stem to resist twisting under high-torque efforts like sprinting or climbing without the weight penalty of a solid aluminum design.

Yes, provided your bike uses a standard 1-1/8 inch threadless steerer tube, which is the industry standard for the vast majority of modern road bikes.

A 6-degree angle is a standard road geometry that allows you to flip the stem to either raise or lower your handlebar height slightly, giving you some flexibility to fine-tune your fit for comfort or aerodynamics.

Titanium is naturally corrosion-resistant, but you should always use a high-quality anti-seize compound on the threads during installation to prevent galvanic corrosion and ensure you can easily adjust or remove the stem in the future.

While it is built with high-strength materials, the Os-99 CSI is specifically engineered for road cycling applications. We recommend sticking to components designed for off-road use if you plan on riding rougher gravel or mountain bike terrain.