Shimano ultegra 6800 double 11 speed chainsetshimanos ultegra 6800 double 11 speed chainset is pro proven enjoying the benefits of trickle down technology from its bigger brother dura ace offering the ideal balance of light weight and stiffness the ultegra 6800 double 11 speed chainset is the perfect choice for competitive riders and cycling enthusiasts weighing in at 765 grams including the bottom bracket this 11 speed chainset is a smooth and durable operator hollowtech ii constructi