Our ultegra series is pro proven as it is a direct trickle down from our dura ace group it stands for state of the art technology proven in pro races the technology used in the new ultegra 6800 series with 11 speed newly designed brakes new chain treatment etc shimano ultegra 6800 cranks the hollowtech ii 11 speed ultegra chainset offers an ideal balance of light weight and stiffness making it the perfect choice for both enthusiast and competitive riders hollowglide hollow outer chainring