Sale Shimano ULTEGRA Di2 ST-R8170 2-speed STI Dual Control left

The redesigned Shimano Ultegra Di2 ST-R8170 levers feature new ergonomics and even more precise brake modulation thanks to SHIMANO’s proven SERVO WAVE technology. Wireless electronic shifting provides even more control.

THE SCIENCE OF SPEED: Shimano Ultegra Di2 2-speed STI Dual Control ST-R8170-L

Great speed means great responsibility. That’s why, faced with the task of making the new ULTEGRA groupset even faster, Shimano decided to take a holistic and 100% performance-focused approach. Shimano’s new 12-speed road groupset delivers unparalleled control and comfort anytime, anywhere – whether you’re competing in an amateur race, chasing your personal best, or out for a social ride. That is “Science of Speed”. And it’s what sets SHIMANO apart from the rest.