Shimano Shifter Switch SW-R9160 Dura-Ace DI2 310602-05 and is a perfect solution

and is a perfect solution for riders with larger hands or riders who simply prefer more grip in hand

Includes DebonAir assembly and C1 sealhead

The massive range means you never have to worry about having the right gear for the terrain

look no further than the Shimano XTR series

Eluding any box it’s confined to

Shimano Shifter Switch SW-R9160 Dura-Ace DI2 310602-05 and is a perfect solutionEasy to push the thumb switch when gripping the top of the TT extension. A single programmable shifter button in each unit, designed to fit cleanly into aerobar extensions. Works perfectly with Shimano's Di2 Synchro Shifting: each "up" shift moves to the next gear ratio considering both front and rear derailleurs, each "down" shift does the reverse. Requires Shimano 9100 Di2 drivetrain. Can be installed as sole shifting point or used in conjunction