Shimano Rear Derailleur Dura-Ace Di2 RD-R9150 11 Speed SS

The new DURA-ACE rear derailleur features Shimano’s Shadow RD design and incorporate these new cockpit functions. The electronic rear derailleur is compact and designed to protect the shifting operation in the event of a crash.

With the introduction of DURA-ACE R9100, Shimano has reestablished the new benchmark for road performance by improving each component and incorporating its newest technologies. DURA-ACE R9100 delivers unparalleled performance, highly-refined ergonomics and immense customization to maximize every rider’s potential.Engineered for the next generation of race bike, DURA-ACE R9100 offers top-tier performance across numerous configurations. Available with either Di2 electronic or mechanical shifting, for the first time, riders now have the option of premium DURA-ACE hydraulic disc brake performance. New Shimano technologies further integrate the DURA-ACE as a system, including a new power meter, while riders further integrate with their bike through new E-Tube wireless connectivity. Shimano’s Rider Tuned philosophy and customization of the bicycle’s function also expands with a wider range drivetrain that now includes intuitive Shimano Synchro Shift control.

Front (FD-R9150) and rear derailleurs (RD-R9150) incorporate these new cockpit functions. Both electronic derailleurs are compact and designed to protect the shifting operation in the event of a crash. The low profile of the rear derailleur also comes with SHIMANO SHADOW RD technology, positioning the derailleur further below the functioning sprocket.

FEATURES

• Ergonomic shifting operation without stress
• SHIMANO synchronized shift
• Low profile rear derailleur design
• SHIMANO SHADOW RD
• Race endurance for less damage in crush
• Maintains compact and smooth appearance

SPECIFICATIONS

• Use: Road
• Group: Dura-Ace Di2
• Model: RD-R9150-SS
• Cage: short
• Mount Type: Direct Mount
• Gear rear: 11-speed
• Compatible Chain: HG-EV 11-speed / HG-X 11-speed
• Max. teeth large sprocket: 30T
• Min. teeth large sprocket: 25T
• Max. teeth small sprocket: 14T
• Min. teeth small sprocket: 11T
• Max. Front Difference: 16T
• Total Capacity: 35T
• Compatible: EW-SD50
• Master unit: No
• Firmware update by E-tube Project: Yes
• E-tube port (pcs): 1
• E-tube connector (pcs): 0
• Material
• Aluminum
• CFRP
• Weight: 204g
  

TECHNOLOGY

Shimano Shadow RD 
The mechanism rear derailleur, SHIMANO SHADOW RD, is intended for more aggressive riding. Its super low profile design carries many benefits. Because of its low profile and single tension construction, the derailleur does not hit the chain stay in rough riding conditions. The result is smooth and silent performance.

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 like 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 Levers so you don’t need to re-program your mind for a new system. 

E-Tube 
E-Tube platform offers optimum flexibility on your bike. E-TUBE transmits interactive signals and power supply to each parts by “Plug & play” connection. E-TUBE is no rust, no stretch, no freeze and it ensures advanced low maintenance. And SM-PCE1 connects between PC and components to update firmware. Digital device stay the latest version with updating firmware for improve function.

Synchro-Shift
SHIMANO Synchronized Shift is a new feature introduced to Shimano´s electronic road groupsets, designed to simplify gear choice and reduce decision making in racing situations. When riding at maximum capacity, decision making can be impaired. The less stresses on a rider and the less decisions a rider has to make, the less mistakes they will make. Therefore SHIMANO Synchronized Shift is designed to choose the next biggest or lowest gear ratio irrespective of whether a gear change needs to be made by the front or rear derailleur.