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Di2 wireless unit

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Old 12-05-18, 01:06 PM
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rower2cyclist
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Di2 wireless unit

Hi everyone-I just purchased a 2019 TCR Adv Pro Disc. This is the first time I'm riding an electronic groupset (and I love it!)

The bike has Shimano Ultegra Di2 but the Giant website doesn't say which model. I am wondering if I need to buy the wireless unit D-fly in order to connect my garmin to the Di2. I tried a few times to connect but was unable to. I am wondering if the bar end junction has built in wireless connectivity or do I still have to buy the wireless unit.

Finally, is the wireless unit a good investment if I have to buy?

Thank you,
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Old 12-05-18, 01:13 PM
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Generally..unless specifically noted--Di2 bikes do not ship with a D-Fly.

I find it a nice accessory. Some don't. YMMV.
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Old 12-05-18, 05:17 PM
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Hey rower.... I was in your shoes several weeks ago. Yes you will need to buy the D-Fly unit AND an extra E-Tube wire (The D-Fly does not come with one). The unit can be installed in-line anywhere you want it. The E-tube wire comes in different lengths, so make sure you order an appropriate size based on where you plan to mount the unit.

I have mine mounted up front under my bars.
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Old 12-05-18, 05:42 PM
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For most Di2 users, it only transmits the current front and rear gear position, and the amount of Di2 battery charge. You can easily check the battery level using the junction box button. I don't really care which gear I'm in, I just shift up or down as needed. And I'd rather see other data on the limited screen display area. (I do look down occasionally to verify which front chainring I'm in.)

From this story, the new DuraAce Di2 shifters have a 3rd button on the hood, which can be set up to control the Garmin display. That could be useful.
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Old 12-05-18, 06:37 PM
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Programing the buttons under your shifter hoods to switch pages on your cycling computer is a nice feature (not just Garmin, I have a Wahoo Element Bolt). I have a main page that displays the data I want when I ride, but pressing a button on the hoods without taking my hand off the shifters to switch to the map screen, or maybe a more comprehensive Power (power meter) screen is very convenient I find.
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Old 12-05-18, 10:08 PM
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I did not know it was possible to switch GPS screens from the hoods.

Very interesting.
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Old 12-05-18, 11:41 PM
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I like having it, but it doesn't do much for me. It allows my Garmin to count how many times I shift, and to tell me the battery level. The battery thing is nice.
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Old 12-06-18, 06:29 AM
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Oh yeah I forgot about that. I don’t use a Garmin, but the Wahoo Elemnt Bolt does an analysis of your shifting over the course of a ride when connected via D-Fly.
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Old 12-06-18, 08:01 AM
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Originally Posted by jadocs View Post
Hey rower.... I was in your shoes several weeks ago. Yes you will need to buy the D-Fly unit AND an extra E-Tube wire (The D-Fly does not come with one). The unit can be installed in-line anywhere you want it. The E-tube wire comes in different lengths, so make sure you order an appropriate size based on where you plan to mount the unit.

I have mine mounted up front under my bars.
Thank you, will make sure I get the correct length if I go down that route


Originally Posted by rm -rf View Post
For most Di2 users, it only transmits the current front and rear gear position, and the amount of Di2 battery charge. You can easily check the battery level using the junction box button. I don't really care which gear I'm in, I just shift up or down as needed. And I'd rather see other data on the limited screen display area. (I do look down occasionally to verify which front chainring I'm in.)

From this story, the new DuraAce Di2 shifters have a 3rd button on the hood, which can be set up to control the Garmin display. That could be useful.
I think mine has the buttons too but will double check that, thanks!
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Old 12-06-18, 08:54 AM
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Originally Posted by TimothyH View Post
I did not know it was possible to switch GPS screens from the hoods.

Very interesting.
This was added to the 8050/8070 group. I waited for that group to be available last January, but and in practice find the buttons hard to push with my weak thumbs, thus as often as not just swipe the Garmin 1000 touch screen.
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Old 12-06-18, 10:45 AM
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I don't have the functionality enabled on my system. BUT I do remember reading somewhere on the interwebs that you could download an open source program which would tell you the percentage of time you spend in a particular gear combination. As someone who is kind of nerdy and like jazz like that, I would find that ability interesting.
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Old 12-06-18, 12:46 PM
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Originally Posted by rm -rf View Post

From this story, the new DuraAce Di2 shifters have a 3rd button on the hood, which can be set up to control the Garmin display. That could be useful.
The new Ultegra has the third button also. I got DA for myself and Ultegra for the old woman and I thought I was going to have to return it and get her DA when she noticed the paging. Feel for the button on top of the hoods. You need the wireless for cellphone programing as well or you don't. The Garmin 820 is a great match for DI2.
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Old 12-06-18, 01:14 PM
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Originally Posted by popeye View Post
The new Ultegra has the third button also. I got DA for myself and Ultegra for the old woman and I thought I was going to have to return it and get her DA when she noticed the paging. Feel for the button on top of the hoods. You need the wireless for cellphone programing as well or you don't. The Garmin 820 is a great match for DI2.

Another reason for me to buy the wireless unit is that we only have an apple computer and shimano software, apparently, only runs on windows. Pretty ridiculous company like shimano doesn't make software that runs on both operating systems.
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Old 12-06-18, 03:01 PM
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Originally Posted by rower2cyclist View Post
Another reason for me to buy the wireless unit is that we only have an apple computer and shimano software, apparently, only runs on windows. Pretty ridiculous company like shimano doesn't make software that runs on both operating systems.
Android is the other OS.
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