Shimano 105 ST-R7170 Shift/Brake Lever - Di2 | 2x12-speed - STI | Hydraulic - right

105 R7100 / R7150 – It's A New Day

For the 40th anniversary since its launch in 1982, the 105 series gets its ultimate upgrade with Shimano's electronic Di2 shifting technology. Maintaining the series-typical price level, the precise shifting function, precisely tuned ratios and a reliable braking system thus become accessible to an even wider circle of road cyclists. Because in the tradition of its predecessors, the current 105 is also equipped with the top technologies – such as the wireless cockpit – and first-class features from the state-of-the-art Dura Ace and Ultegra series to enable their riders to discover the road anew, every single day.

Shimano 105 Di2 RD-R7170 STI brake/shift lever

As with the current STI levers of the Dura Ace and Ultegra series, Shimano has again collaborated with professional riders in the development of the electronic 2x12-speed control units of the 105 series. Not only that also a Wireless system has found its way to provide a tidy and wonderfully minimalist cockpit, also at the ergonomics was extensively tweaked. Characteristic of the revised aesthetics and aerodynamics are above all the raised lever hoods, which prevent fatigue regardless of the hand position and ensure first-class comfort.

But also on the technical side, the compact dual control levers know how to convince. While the reach adjustment mechanism allows adaptation to different hand sizes or riding styles and thus promises more control in racing, the button functions that can be individually assigned via E-Tube app benefit an essential task of the control units: the shifting performance. A self-developed circuit ensures reliable and fast signal transmission, which not only enables more precise and direct shifting processes in manual mode, but also more intuitive ones. Athletes who want to devote themselves fully to racing can also leave the gear changes completely or at least partially to the Synchronized Shifting technology.

The switch to electronic Di2 shifting naturally also offers decisive advantages in terms of ease of maintenance. With a battery life of at least 3 years, no rider needs to worry about powering the wireless shift/brake levers either. Speaking of brakes, with an extended control range, also the smooth Servowave brake levers experienced a significant upgrade in terms of dosage and deceleration performance.

Ports: 1x EW-SD300

Synchronized Shifting | Shimano's Synchro-Shift technology simplifies shifting immensely and significantly reduces the amount of decision-making processes that take place while riding. The system always selects  the optimal next higher or next lower gear ratio combination, regardless of whether the rear and / or front derailleur are used for this purpose. In addition to the conventional manual mode, in which the front and rear derailleurs are controlled independently of each other, Synchro-Shift offers two further modes:

• Full Synchro-Shift. The front derailleur responds to the shifts made by the rider on the rear derailleur. Essentially, this means that only one shift lever with two shifters is needed to operate the rear derailleur and front derailleur.

• Semi Synchro-Shift. The rear derailleur responds to the shifts made by the rider on the front derailleur. In doing so, the rear derailleur automatically provides the necessary compensation shifting for low cadence jumps when shifting up or down at the front derailleur.

SERVOWAVE | Shimano's SERVOWAVE technology improves brake lever's modulation ability. Because the lever absorbs a lot of braking distance right at the start of its movement, the brake pads have disc contact more quickly and it remains more lever travel to adjust braking force. That is why SERVO WAVE brake systems are characterized by faster response, higher performance and shorter idle travel.

Material: aluminum (anodized), glass fiber reinforced plastic (GFRP)

Compatibility:

• front derailleur: FD-R7150, FD-R9250, FD-R8150
• rear derailleur: RD-R7150, RD-R9250, RD-R8150
• sub brake lever: BL-RX812
• brake caliper: BR-R7170, BR-R9270, BR-R8170, BR-RX820-LE
• brake hose: SM-BH90-J-SSR, SM-BH90-JK-SSR

(manufacturer recommendations, listing not final)

Weight: approx. 423 g (pair; manufacturer's specification)

Scope of supply:
brake/shift lever incl. 2 CR1632 batteries
(without EW-SD300 Di2 cable)