Shimano Dura-Ace ST-R9170 Di2 Hydraulic STI Brake Lever

Top of the range, high performance Dura-Ace hydraulic disc brake Di2 STI’s give you control, modulation and power
with minimal effort in all riding conditions.

With a compact overall shape, the Dura-Ace R9150 levers bring both Shimano’s praised hydraulic disc brake technology
and the category-leading Di2 electronic shifting in a package ready for the most demanding of race situations.
An updated button feel and layout ensure precise shifting while enhanced ergonomics guarantee comfort, allowing
you to concentrate on the effort at hand.

Technology

Free Stroke

The distance from initial lever position to pad contact point can be adjusted to suit any hand size, type of riding
and individual rider preferences.

SEIS

A technological innovation of the computerized shifting system based on the Di2 concept with which is called, the
SEIS (Shimano Electronic Intelligent System).

The SEIS innovative shift technology is still 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 past two years by several professional riders in all
conditions possible, such as rain, mud, low temperatures, cobble stone 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 on 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.

E-Tube

E-Tube is Shimano’s “service” that uses websites or apps to maximize the enjoyment of riding a bicycle by connecting
the riders, the bicycles and Shimano.

Shimano’s genuine application E-Tube Project for Mobile allows you to customize your bike, update firmware, and
maintain it by connecting it wirelessly to your bike. You can also get the more detailed bike maintenance by
connecting to your bike by wire with E-Tube Project for Windows V4 application.

• Easily update to the latest firmware with the user-friendly interface
• Set two e-bike assist profiles to your preference, and customize the assist characteristics according to the
  riding situation
• Design your favorite Di2 gearshift in Synchronized Shift
• Easily adjust both front and rear derailleurs via application

Reach Adjust

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.

Features

• With Di2 technology shifting is easy and precise – just a light touch, as soft as a mouse click, is
  sufficient for the front or rear derailleur to instantaneously select the correct gear
• The removal of traditional mechanical cables in favour of electrical wires eliminates poor shifting caused
  by contaminates, corrosion and stretching, and also provides effortless gear shifts
• Simply pressing tactile buttons allows effortless and comfortable shifting even when your hands are cold
• Shifters are lightweight thanks to carbon fibre lever blades, carbon composite bracket body, and a titanium
  clamp band / fixing bolt
• Drop bar STI with shift buttons located in a near identical place to the positions you’d assume shifting
  using a mechanical Shimano STI
• Hydraulic brake lever provides excellent stopping power with less effort especially from the hood position
• Hydraulic reservoir tank provides pad to rotor clearance auto-adjust maintaining braking performance during
  pad wear
• Finely tuneable reach adjusters for the levers enable custom fitment for all hands
• Free stroke adjustment for pad to rotor contact setting
• Levers are supplied without electrical cables, as these need to be ordered separately to suit
• Two ports for use with E-tube electric cables
• Weight is 360 grams a pair