The Cervlo ST31 Stem was made to work seamlessly with the Caledonia-5. It integrates perfectly with this bike, featuring an aerodynamic profile that fits in with the frames geometry. It also works with the Aspero-5, R5, and R5-CX and has an 8-degree rise. An integrated top cap also prevents wind from slowing down a ride. The stem is made with a lightweight and extremely stiff carbon fiber, resulting in an excellent weight to stiffness ratio. It is easily mounted thanks to the Cervlo BarFly mounting system. Ready to internally house Di2 cables, the ST31 stem is the perfect piece to upgrade your bike.