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Shimano 105 to Dura Ace Di2

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Shimano 105 to Dura Ace Di2

Old 05-07-20, 10:20 PM
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Shimano 105 to Dura Ace Di2


I want to slowly work my way to Dura Ace Di2 and do not want to upgrade all the pieces at once. I currently have Shimano 105 R7000 and Shimano 105 hydraulic disc brakes. My ultimate goal is to get to Dura Ace Di2 shifting, If not required I would leave the hydraulic disc brakes the way they are. Can anyone provide me advice on what I can switch by itself that is still compatible with the 105s and what must change together, i.e. rear derailleur with electronic shifter. Never done a piece meal upgrade before. Thank you in advance for any assistance.
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Old 05-07-20, 11:34 PM
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If you are planning on keeping your current calipers/rotors, then the only other component that would be compatible with both mechanical and di2 would be the crank. Everything else (front/rear derailleurs, shifters, wires, junction boxes, battery) would have to all be done all at once.
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Old 05-08-20, 08:26 AM
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I would do something like ths


you can get the dura ace kit for $1600 from the same place but you will not notice any performance difference, just a little weight savings.
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Old 05-08-20, 09:20 AM
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My advice? Wait until you have enough money and change the whole thing.

If DA is too expensive (I don't want to be rude, but based on your post, it is), Ultegra DI2 would meet your needs.
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Old 05-08-20, 09:26 AM
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We have Ultegra and DA DI2 and they are now functionally the same. At one time the U did not have the top hood buttons.
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Old 05-08-20, 09:33 AM
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I wouldn’t bother going DA when Ultegra is the same functionality. Outside of weight savings, and when leaving 105 components in place, that defeats the purpose.

Ive done a partial upgrade. It’s about $1100 or so.
- Shifters
- F derailer
- R derailer
- Battery
- Charger
- Display unit for h-bar. It has 3 ports (L shifter, R shift, cable to rear), BT connection and the charger port, it’s $90 so is cheaper than an A junction and BT WU111 unit.
- B junction
- Cables, 6 total
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Old 05-08-20, 11:16 AM
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I've ridden 11 speed Shimano 105 5800 for about 4 years. I got an Ultegra Di2 bike in March and it's great. Would I upgrade an existing bike to Di2? No.

My 105 shifts so flawlessly that I can't imagine anything better. It takes one or two times a year I go back and adjust everything to keep it that way. Di2 has the promise of not needing to do those adjustments, so that will be a plus.

Functionally, I can use all my gear combos with the 105, big, big and small small. Di2 won't let you do the small small without tricking it.

Will my next bike have Di2? Probably. It is nice. I just wouldn't upgrade a bike from 105 5800 or later to Di2. Not enough bang, Only gives you bragging ability.

And where are you going to put all the battery and stuff? Mine is in the tubes and handlebar. External stuff looks hokey. Sorry guys....those of you that have the external.

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Old 05-08-20, 02:44 PM
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Agree with Iride, it's tough to justify as it's at minimum $1100, assuming you are keeping the brake calipers, crank and b-bracket, cassette and chain. Swapping any of that adds to the budget. As well it helps to know how to and have the tools to install a hydraulic brake system as you will be draining the existing than running new cables and fluid. Then you hopefully have a BSA bottom bracket to access the area to run cables. I only did my system as I was installing on a cheap Chinese carbon frame so didn't have a huge cash outlay existing and could justify the cost of the Di2 system.
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Old 05-09-20, 02:02 PM
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I have 105 on my TCR and DuraAce DI2 on my S5. When it comes time to replace the 105 I’ll probably go mechanical Ultegra. DI2 is super nice and I’ve had no issue with it, but as mentioned above it is bragging rights IMO.


Last edited by trainsktg; 05-10-20 at 05:07 PM.
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Old 05-10-20, 06:06 AM
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I agree with the above comments. I have a 105 7000 bike and an Ultegra Di2 8050 bike and the 7000 is flawless. The Di2 is great, quick, precise, love the Garmin integration, etc, but I wouldn’t swap perfectly good 105 for it. The 105 groupset is fantastic.
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Old 05-12-20, 07:00 AM
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I have ZERO experience with electronic shifting. But, I do have 105 on my Colnago CX and CAAD 12. In addition I have older DA on my Masi road bike and SRAM Red (newer) on my Guru Sidero. I love the SRAM Red and am impressed with the lasting quality of the DA which is 15 yrs. old. But....the 105 is as good as any of it. IMO 105 is a tremendous value. I'd be reluctant to swap it out and spend a lot of money doing it.
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Old 05-12-20, 07:05 AM
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+1 for Ultegra di2, unless you just have money to burn. If they had 105 di2, I would have gone for that. lol

Absolutely love my di2, have 3k miles on it now and I'll never go back.
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Old 05-12-20, 07:40 AM
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Yep, nothing but the crank. Put one on and see if it still seems like a good plan. Easy swap.
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