If you've done a TT right, you probably puked at least a little bit and you might not even know your own name. The last thing you need in the final kilometers are a bunch of shift buttons to confuse you. The Shimano Dura-Ace 9070 Di2 1-Button TT Shift Lever makes your job easy; it only controls the rear derailleur - one button to shift up and the other to shift down - so you can concentrate on riding so hard that you pass out. Designed for pro TT specialist, the Di2 1-Button TT Shift Lever is compatible with both 10 and 11SPD Etube systems.
Fast, accurate, effortless shifts SW-9071 (single-button controls minimize movements for maximum aero efficiency)
works with 10 or 11SPD Etube Di2 systems
shifters only shift the rear derailleur, one button to shift up the other to shift down
design requested by pro TT specialists
not compatible with 7970 Di2 systems