Shifter Shimano DURA-ACE Di2 ST-R9170 2-speed

Product technical specification

Brake lever is equipped with a reach adjust mechanism. The distance from handlebar grip to lever can be adjusted to suit any hand size, type of riding, and individual rider preferences.

SEIS - innovative shift technology based on the SHIMANO INDEX SYSTEM (SIS) that has proved its superior gear changing characteristics over the years. The big difference is that in this case, the shifting action is provided for by electronics instead of mechanics. This electronic shifting system has been extensively tested over the past two years by several professional riders in all conditions possible, such as rain, mud, low temperatures, cobblestone roads, and combinations of all of these at the same time. Shifting is executed by simply pressing the button. No power is needed to shift, which gives important advantages since it is easier now to always keep a tight grip on the handlebar and to keep your concentration on riding instead of shifting. The shift system allows accurate and effortless shifting in difficult circumstances, for example when you have cold hands or when you are completely exhausted. Furthermore, the shifting performance will never be affected by contaminated or stretched cables since the shifting signal is transferred electronically. The operating buttons work similarly to mechanical DUAL CONTROL LEVER, so you don’t need to re-program your mind for the SEIS.

Di2 - The advantages of Di2 (Digital Integrated Intelligence) are clear for everybody who has tested it: changing gears becomes easier, effortless and faster by simply touching the shift buttons. Control at the top of your fingers. Additional benefits include an automatic trimming front derailleur, unmatched precision plus super easy installation and adjustment. This allows automatic chain guide movement in response to the gear position of the rear derailleur. There is no more need for concentration on trimming when riding.

Important: All Shimano Di2 electronic components require the same firmware version. In order to diagnose, read or update firmware, an optional device is needed. Operating components with different firmware versions may cause malfunction or loss of function.