So, every Shimano equipped triathlon bike regardless of derailleurs uses the same shifter, The Shimano Dura-Ace Sl-BS78 10 Speed Bar End Shifter. The quality of the shift you feel is delivered through the tactile interface between your hand and the shifter. Whether you are using a Shimano 105, Ultegra, Ultegra SL or Dura-Ace derailleur or a mix of those derailleurs you will be shifting with the same shifter. The shift will require the same distance of lever travel and feel the same through the lever. Because of this, it is very difficult for anyone to tell the difference between Shimano Ultegra and Shimano Dura-Ace shift quality when using bar end shifters. We interviewed two bicycle company product managers, three sales reps, two technical reps, several elite level amateur triathletes and one nine-time Tour de France finisher about the difference between Shimano Dura-Ace and Shimano Ultegra when using the bar end shifters and their response was unanimous: They each said they could not tell an Ultegra Rear derailleur from a Dura-Ace rear derailleur on shift quality using bar end shifters.