your Shimano’s Di2 electronic shifting has long been an excellent shifting system on road bikes, but is arguably even better on tri bikes. Eliminating the numerous twists and kinks that are inherent in aero bike cabling, while offering push button ease, offers big benefits when it comes to staying aero, reducing maintenance, maintaining cadence and improving shift quality. Shimano’s new Dura Ace 9150 and Ultegra 8050 Di2 shifting system (designated 9160 and 8060 with aero shifters) does all that previous generation Di2 does. However, it has some new tricks too; tricks in the form of Shimano Di2 Synchro Shift, which makes shifting on a tri bike easier than ever. As easy as just having one button to shift into a higher gear and another to shift into a lower and no others (the previous generation 6870 had separate buttons for the front and rear derailleur).