The Shimano Ultegra Di2 ST-R8150 12 Speed STI Shifter Set (Rim Brake) delivers fast, reliable electronic shifting with a crisp, defined click feel. Designed for high-performance road cycling, these dual-control levers integrate shifting and braking for precise, intuitive control in any conditions. Lightweight and compatible with the Ultegra R8100 series, they enhance overall ride quality with ergonomically shaped hoods that optimize grip and brake power transmission.