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Re: DIY Ultegra Di2 TT [ In reply to ]
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Great, I now have two levers, both right levers from Ultegra 6870, can I reprogram one of them to serve as a "left" shifter. Since I only be using the black-box from lever.

Is there anyone who has made thier own junctionboxes or just solder the wires togheter?
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Re: DIY Ultegra Di2 TT [dontpanic] [ In reply to ]
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not sure about soldering wires etc. but you can definitely programme the buttons whichever way you want, either with Bluetooth & app or PC-link
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Re: DIY Ultegra Di2 TT [dontpanic] [ In reply to ]
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1. What do you mean by "black box?"
Every Di2 shifter has a network interface that identifies itself to the CAN bus network and interprets the button clicks and sends the click signals to the network. If every device has a totally unique identifier, it may be possible to configure two same devices to behave differently. Or, the e-tube project SW and CAN bus controller may only recognize one of each type of device and not allow individual configuration of like devices. The only way to know is to test it and see.

2. I would not try to solder cables into a hacked Junction B. A Junction B is only $20 USD; the hack is not worth it.
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Re: DIY Ultegra Di2 TT [exxxviii] [ In reply to ]
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By the "black box" i mean that I will remove the electronics from the lever, the little box that has the ports and two buttons attached to it by a wire. I happen to have two crashed right lever over, I will try it and see :)
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Re: DIY Ultegra Di2 TT [dontpanic] [ In reply to ]
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What is your high-level objective behind the questions you are asking?

In general, you can use any of the various shift button options individually or with any others. The exception is the SW-R610 sprint shift button which does not contain Di2 electronics and must be connected to a special port on standard brake/shifters. Furthermore, you can individually program the function of each button on a shifter.

What I do not know is whether you can have two of the same components on the Di2 network. For example, you may not be able to have two left SW-R671 button modules in the system. You would have to test it to find out, but my hunch is probably not.

If you wanted to, you could break down SW-R671 and wire it to custom buttons on each bullhorn. Then, you could program those buttons to shift the RD up and down. That would require Synchro mode, but it would work. Similarly, you could break down a pair of SW-R671 buttons and wire them to custom buttons on the bullhorns and program the buttons to shift the FD and RD up and down as you like. Then, you could use a different button type on the extensions, like the new SW-R9160 buttons. Or, you could do the above tear-down with SW-R600 buttons for the bullhorns and then use unmodified SW-R671 buttons for the extensions.
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Re: DIY Ultegra Di2 TT [exxxviii] [ In reply to ]
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My goal is to use some buttons I already built for another bike, I connected these to the right levers sprint shifter ports. Since I do not use my front shifter that often I figure I just place the small box/buttons from the "left" lever (if I can reprogram it) on the handlebar somewhere.

I guess I can try it since I already have two right levers, but i guess it might not work.
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