Shimano ultegra 6750 10sp chainset no boltsthe shimano ultegra 6750 10 speed chainset features the dura ace proven 4 arm crank meaning you can swap the chainring tooth count to suit the type of riding you are doing without having to change the entire chainset the ultegra 6750 offers the ideal balance of low weight and stiffness making it the perfect choice for both enthusiast and competitive riders ready for the sprintthe ultegra 6750s hollowtech ii cold forged hollow crank arms and hollo