The ST-C035 stem is specifically designed for 2023 and newer S5 framesets. These stems feature a unique, modular-integrated stem-bar system along with a proprietary steerer tube interface that all create a singular looking and performing forward cockpit with full integrated routing into the frame. The V-shaped ST-C035 Carbon Stem was designed solely for these S5's, and is only compatible with the Cervelo AB-08 Carbon Handlebar.