The shimano ultegra cn 6701 chainhas plate shaping that mirrors the more expensive 7901 dura ace chain therefore the performance is for all practical purposes identical you39ll get the same crisp lightning fast shifts thanks to shimano39s asymmetrical design here39s how the ultegra differs from the dura ace weight and finish rather than having perforated inner and outer plates only the inner plates on this mountian bike chain have been relieved of excess material the lin