With and cassette options, DURA-ACE riders now have even lower climbing gears so that no matter your riding level, you can experience the best road performance available. Despite even wider gear ranges, smooth, consistent gear steps remain a Shimano hallmark. Keeping things simple, the R rear derailleur is offered with a single cage length that is compatible with the entire range of R cassettes.
The lever body reach is also extended by 4. The longer switches are easier to reach when riding in the drops and an increased offset between the switches makes them easier to differentiate while riding. A third switch on the hoods continues with the new R series shifters. A set of new remote switches provides multiple shift points with options for the tops as well as the drops. So whether climbing at your limit or sprinting for the line, you have can control your effort.
Offering a suite of customizable, riders can choose between different shift speeds, customize shift button mapping what buttons performs which functions , program different automatic shift modes like Synchro and Semi-Synchro shifts, finetune shifting, and connect with third party bike computers.
Shane Miller - GPLama. In doing so, I realized that people have a lot of questions about Di2 and the answers are difficult to find. This lead me to create this article, to consolidate everything I know and have been asked into one location so people can find answers. Power and shift commands are sent via a 2-wire CAN Controller Area Network datalink contained within a single cable housing.
This design has several advantages over conventional mechanical shifting systems, the most notable of which are:. Released in , the operated using a very basic 5-wire electronic system.
Each shift button was connected to a different wire; shorting the specific wires together controlled the derailleur upshifts and downshifts. Because the first generation used completely different technologies than the newer 2-wire systems, none of the components are cross-compatible. At this point, Shimano is not expected to offer any updates or new components using the first generation architecture; everything from now on will be based on the newer 2-wire E-tube design.
The second generation design offers several advantages, which include: 1 smaller wire size, smaller connector size, waterproof connectors; 2 all switches can be reconfigured in software to send upshift or downshift commands to either the front or rear derailleur; 3 firmware updates can add new features such as multi-shift and compatibility with new components.
The confusing naming system used by Shimano makes it difficult to figure out what each component is, much less what is compatible between systems. Here are some compatibility guidelines:. The speed Dura-Ace and Ultegra rear derailleurs are designed exclusively for speed rear sprockets and speed Front Derailleurs. The sprocket spacing is slightly smaller and the overall range of travel slightly longer on speed systems.
If you have speed wheels and speed sprockets, you should use the speed RD rear derailleur and a speed FD front derailleur. Similarly, a speed RD rear derailleur should not be used with speed sprockets. There will be chatter in some gears, and there might be slow-shifts or self-shifts. Front Chain Rings: In general, most any front chain rings will work, rigid forged rings work best with Di2 due to high front derailleur shift forces. Shimano chain rings tend to be the best, but most others work as well.
In emergency situations, speed rear derailleurs can be used with speed sprockets. There will probably be chatter in some gears, and there might be slow-shifts or self-shifts. Included for very motivated individuals only: speed front derailleurs can be used with speed rear derailleurs if the shifters and battery have firmware installed from E-tube software version 2. Shimano disabled support for this speed and speed cross-matching with later firmware updates.
For informational purposes only, the details of how to regain compatibility are detailed below. A single battery charge should give at least miles of riding. Most riders will not need to charge the battery more than twice a year. To check the battery charge remaining, press and hold any shifting switch for 0. The amount of battery charge remaining will be indicated by the light on Front Controller A Junction.
When the battery charge is low, first the front derailleur will stop operating, and then the rear derailleur will stop operating. When the battery charge has been fully spent, the derailleurs will be fixed at the last gear shifting position. If the battery indicator is illuminated red, it is recommended that you recharge the battery as soon as possible. Follow the steps below to properly align the rear derailleur with the rear sprockets.
The FD trim adjustment effects the auto-trim positions. So for example, if the FD outer plate rubs the chain when using the 6th largest cog, you would want to adjust the FD trim outward a couple ticks.
Etube forces the derailleurs into this maximum cross-chained position, whereas during the manual method you must shift to these positions yourself. Thanks to commenter Bryan B for the info. It can also be used to enable multi-shift multi-shift is where the shifter is held and the rear derailleur shifts through multiple gears until the shifter is released. The delay between of the gear changes during multi-shifting can also be adjusted.
This plugs into a special port on the side of the A junctions which is covered by a rubber flap. This adapter charges the internal battery when first plugged into the A junction; it must be powered by a standard USB Wall charger such as that used for an Apple iPhone or a PC that is powered-on.
It must be detached from the computer and reattached to switch back to charging mode. Hacking the SM-BCR2 to have a standard Di2 cable connector: If your 3-port or 5-port junction is inaccessible for charging, there is an alternative hack method to connect it to the system through a standard Di2 port. With basic soldering skills you can hack the BCR2 to be used with any setup.
Buy any length EW-SD50 wire, cut off one end. Cut the wire on the output side of the BCR2. Splice the two wires together, so that the output wire of the BCR2 is now a standard Di2 connector.
The charger has an inner white and outer shield wire; connect the inner white wire to the SD50 red wire; connect the charger outer shield wire to the SD50 black wire. You will then be able to plug the BCR2 into any Di2 port. Thanks to Di2diy for the info. It attaches to via the standard E-tube wire just like the EW-SD50 cables rather than to a dedicated port on the side of the front A junction.
Bluetooth and E-tube Apps for Apple iOS and Android: Bluetooth wireless modules are available to allow system settings to be adjusted via the mobile applications that connect via Bluetooth Adapters. The confusing naming system used by Shimano makes it difficult to figure out what each component is, much less what it does and how it fits into an a complete Di2 system.
As like the Ultegra version, they are compatible with the climbing shifters. There is no Ultegra option offered at this time. Combined weight both levers: grams. Slightly heavier and much less expensive than the Dura-Ace version. These require the BR dual piston hydraulic disc calipers. For both, the lower button upshifts into a harder gear and the upper button downshifts to an easier gear.
This can be changed using the Shimano E-tube Project software; the functions of the left and right sifters can be switched with one another as well. These are available in pairs or separately. I personally think this version is absolutely worthless. Why have 2 SW shifters at twice the price and twice the weight, when you can just buy a single SW-R Right shifter instead. Unlike all of the other shifters, the sprint shifters do not contain a circuit board; they do not show up as components on the CAN bus network.
The host dual control lever is what sends the shift command. Note: Any momentary switch can be attached to the sprint shifter port on the Dual Control Levers by splicing into a standard EW-SD50 wire to act as remote shifters.
SW-R Time Trial bar-end shifters pair : These are-end shifters directly control the rear derailleur, with one for the upshfit and one for the downshift.
The front derailleur is controlled automatically via automatic Synchronized Shifting. They come with plastic mounts to make it easier to attach to bars beneath bar tape. They are ideal for synchronized shifting, with one controlling the upshifts and the other downshifts.
FD Ultegra Front Derailleur, pretty much identical to the FD but with a slightly larger diameter adjusting screw to better dissipate the shifting forces. It uses an 8-speed or speed internal epicyclic rear hub. It is believed to be compatible with other Di2 ETube components but this has not been verified. It has an 2 wiring ports, so it can be connected between a front shifter and the Front Junction A, or at the rear derailleur between rear derailleur and Etube wire.
It is powered by the same Di2 system battery. Both the current and the previous generation Di2 have a button on the Junction box. Depending on what battery you use, the button does different things. The modern Di2 batteries allow you to enter Bluetooth LE connection mode. Note that this Bluetooth connection only works if you have a Wireless Unit on your bike.
Also, if you have a synchro-shift enabled bike, pressing the button twice will let you switch shift modes. Modern Di2 builds will switch on additional lights right after displaying the battery status. These show you the currently selected shift mode :.
If you've read the little bit of paper that is the Junction A manual then you may have seen that you can connect your mobile phone or tablet to your bike. The document shows you how to enter pairing mode and how to make connections.
No matter how much your bike cost, it most likely does not come with a D-fly. These units are considered add-ons. All road Di2 builds that use the modern BT-DN battery support different shift modes and synchro-shifting.
This means the system will switch the rear derailleur when you change chainring, or shifts the front derailleur automatically when you shift the cassette to a certain sprocket. I've written a pretty big 'complete guide' on Synchronized Shift before, so read that if you want to know everything there is to know about synchronized shifting.
You can also set up synchronized shifting using the mobile app , if you have a wireless unit installed. You can change between the shift modes by double-pressing the button on your junction box. When you do this the bike cycles through three modes:. More information on these shift modes can be found on the Synchroshift: how does it work page. If you're on Windows you can use E-Tube Project software to connect your bike to your computer and change a variety of settings:.
However, if you are a Mac user then you're out of luck. Shimano haven't made the software available for Mac. Have a look at his video on that and also his Di2 playlist for some more nice videos. Also, if your bike has a D-fly installed you will be able to change settings using your mobile phone Android and iOS or tablet. Sometimes a firmware update is required in order for features to work, or to fix issues. One example is synchronized shifting. Synchro shifting is enabled on older generation Di2 if the firmware is up-to-date and the other requirements see above are met.
You can read how to update your Di2 firmware on this page. Do you have and older generation bike but want to have buttons on the shifters?
You probably can — have a look at the compatibility charts and see whether your system is compatible. You can use the e-Tube project software to change the button functionality. As long as all Di2 ports have either Di2 wires or dummy plugs in them, they're pretty much waterproof. Just like you would with a mechanically shifted bike, use water and soap or any other cleaner. Using a garden hose is fine, but high-pressure washing your hubs or bearings is not encouraged. Not much can go wrong transporting your bike.
The only thing you should keep in mind is that a Di2 derailleur will try to shift and keep trying when a shifter button is pressed. This means that if you put your bike in the back of your car you should take care that your bike is not trying to shift all the way to your destination — that would mean getting there with an empty battery. There is a lot of other information on Di2 out there, you just have to know where to look.
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