Shimano Ultegra Di2 ST-R8170 12 Speed Shifters Size:Left IAV Power and gyroscope -

IAV Power and gyroscope - Unlike others

minimising show-through and ensuring complete coverage

The wheel structure enables reducing energy dissipation

Carry case

Uses 89% less packaging that two 1 Ltr Muc-Off bottles

Shimano Ultegra Di2 ST-R8170 12 Speed Shifters Size:Left IAV Power and gyroscope -When developing the Ultegra R8100 series, Shimano took a holistic, performance oriented approach, because great speed means great responsibility. Faster than ever, the Shimano Ultegra Di2 ST R8170 12 Speed Shifters deliver unparalleled control and comfort anytime, anywhere, whether in an everyman race, on the hunt for a personal best, or on a companionable ride. As with Dura Ace R9200, Hyperglide+ makes its way into Ultegra's components, and its Di2