DA 9100 mechanical vs Ultegra Di2 R8000 - Build Advice

Discuss light weight issues concerning road bikes & parts.
SilentDrone
Posts: 88
Joined: Fri Sep 22, 2017 5:55 pm

by SilentDrone

Is there a consensus about which way to go on this question?

I’ll soon be ordering a P1 Trek Domane SLR Disc and the price difference between these two groups is the same [edit: the cost of the two is the same when building a P1 they trek]. I tend to want to go with the DA 9100 mechanical because it works well, it’s lighter, and it’s the top tier group. But many have told me that I should go with the the Ultegra Di2 R8000 because the electric shifting is pure awesomeness and “it’s just as good as Dura Ace”.

What would you recommend and why?




Sent from my iPhone using Tapatalk
Last edited by SilentDrone on Fri Dec 29, 2017 9:57 pm, edited 1 time in total.

dudemanppl
Posts: 694
Joined: Fri Feb 22, 2013 5:09 am

by dudemanppl

Di2 because the mechanical hydro levers are fat, ugly, and bulbous.

by Weenie


madik
Posts: 74
Joined: Sun Jan 08, 2017 12:44 pm

by madik

Yeah di2 Ultegra will be the better option. The overall weight wont be very different between the mechanical DA and Ultegra di2, the tie breaker would be crankset which can be replaced relativelly easily to DA or something else lighter.

SilentDrone
Posts: 88
Joined: Fri Sep 22, 2017 5:55 pm

by SilentDrone

madik wrote:
Fri Dec 29, 2017 11:05 pm
Yeah di2 Ultegra will be the better option. The overall weight wont be very different between the mechanical DA and Ultegra di2, the tie breaker would be crankset which can be replaced relativelly easily to DA or something else lighter.
Why?

SilentDrone
Posts: 88
Joined: Fri Sep 22, 2017 5:55 pm

by SilentDrone

dudemanppl wrote:
Fri Dec 29, 2017 10:50 pm
Di2 because the mechanical hydro levers are fat, ugly, and bulbous.
I thought they fixed that with the 9100 group. Hydro and disc shifters are close in size, no?

dim
Posts: 177
Joined: Fri Oct 13, 2017 11:25 am
Location: Cambridge UK

by dim

SilentDrone wrote:
Fri Dec 29, 2017 11:10 pm
madik wrote:
Fri Dec 29, 2017 11:05 pm
Yeah di2 Ultegra will be the better option. The overall weight wont be very different between the mechanical DA and Ultegra di2, the tie breaker would be crankset which can be replaced relativelly easily to DA or something else lighter.
Why?
because it looks a lot nicer and adds the bling bling ....

I'm looking at upgrading, but I may mix and match if I find a good price on 2nd hand components on ebay

I'm looking at Dura Ace 9000 crankset, front deraillier, shifters, and a longer cage rear derailler (might be ultegra), so that I can fit a 11-32 cassette, and M5 Ligfietsen CNC Caliper Brakes tune zero gravity. (I'm still researching, and hope that the combo will work fine)

I'm buying 2nd hand on Ebay and wll do it in stages on the cheap
Giant TCR
Canyon Endurace AL
Whyte Suffolk Gravel Bike

madik
Posts: 74
Joined: Sun Jan 08, 2017 12:44 pm

by madik

SilentDrone wrote:
Fri Dec 29, 2017 11:10 pm
madik wrote:
Fri Dec 29, 2017 11:05 pm
Yeah di2 Ultegra will be the better option. The overall weight wont be very different between the mechanical DA and Ultegra di2, the tie breaker would be crankset which can be replaced relativelly easily to DA or something else lighter.
Why?
Electronic shifting is more awesome, ST-R8070 are circa 180g lighter than ST-R9120. Go figure.

Titusrider
Posts: 21
Joined: Wed Sep 27, 2017 11:02 am
Location: Surrey, UK

by Titusrider

SilentDrone wrote:
Fri Dec 29, 2017 11:13 pm
dudemanppl wrote:
Fri Dec 29, 2017 10:50 pm
Di2 because the mechanical hydro levers are fat, ugly, and bulbous.
I thought they fixed that with the 9100 group. Hydro and disc shifters are close in size, no?
Not the r9120, they are better than the previous generations but still significantly bigger the the rim brake or the hydro di2

I'm going with r9120 for my build as I am determined to have mechanical but see my build thread for the weights, it is not weenie!

See this pic - bottom left is the ultegra equivalent and gives a good impression of size
Image

This is a bike with them on, looks fine to me but I can see how it might not to others
https://www.toykyo.be/case/rapha-x-parlee

SilentDrone
Posts: 88
Joined: Fri Sep 22, 2017 5:55 pm

by SilentDrone

madik wrote: Electronic shifting is more awesome, ST-R8070 are circa 180g lighter than ST-R9120. Go figure.
Overall the DA mechanical group will be around 300 grams lighter than the ultegra Di2 group.


Sent from my iPhone using Tapatalk

SilentDrone
Posts: 88
Joined: Fri Sep 22, 2017 5:55 pm

by SilentDrone

dim wrote: because it looks a lot nicer and adds the bling bling ....
I would never consider an ultegra group to have more bling than a dura ace group.


Sent from my iPhone using Tapatalk

fromtrektocolnago
Posts: 989
Joined: Sat Dec 07, 2013 10:15 pm

by fromtrektocolnago

Comparing di2 to mecanical is apples to oranges. preferences are personal. Really depends if you prefer the simplicity of mechanical or the techiness and shifting ease of di2. personally i like mechanical. electronic is anathema to what cycling should be in my book. others will of course differ. But in any response you are inviting that bias.
Colnago C-59 (Dura Ace)
Firefly(Ultegra)
Trek 5200(ultegra)

pdlpsher1
Posts: 1413
Joined: Thu Jul 19, 2012 6:09 pm
Location: CO

by pdlpsher1

fromtrektocolnago wrote:
Mon Jan 01, 2018 5:13 pm
Comparing di2 to mecanical is apples to oranges. preferences are personal. Really depends if you prefer the simplicity of mechanical or the techiness and shifting ease of di2. personally i like mechanical. electronic is anathema to what cycling should be in my book. others will of course differ. But in any response you are inviting that bias.
+1. I have both. And I could live with either system. I get occasional mis-shifts on my mechanical group but it's not like it ruined the fun of the ride.

I think what makes the decision so difficult for the OP is that he's comparing two systems that roughly costs the same, and each system has its pluses and minues :D

fromtrektocolnago
Posts: 989
Joined: Sat Dec 07, 2013 10:15 pm

by fromtrektocolnago

pdlpsher1 wrote:
Mon Jan 01, 2018 5:22 pm
fromtrektocolnago wrote:
Mon Jan 01, 2018 5:13 pm
Comparing di2 to mecanical is apples to oranges. preferences are personal. Really depends if you prefer the simplicity of mechanical or the techiness and shifting ease of di2. personally i like mechanical. electronic is anathema to what cycling should be in my book. others will of course differ. But in any response you are inviting that bias.
+1. I have both. And I could live with either system. I get occasional mis-shifts on my mechanical group but it's not like it ruined the fun of the ride.

I think what makes the decision so difficult for the OP is that he's comparing two systems that roughly costs the same, and each system has its pluses and minues :D
i was biking in france this sept and someone on a new di2 bike had a shifting failure nobody could figure out for a few hours. turns out a connector got loose. i'll stick with my 9000 mechanical. you can laugh at this , but this stuff does happen
Colnago C-59 (Dura Ace)
Firefly(Ultegra)
Trek 5200(ultegra)

adilosnave
Posts: 2
Joined: Sat Dec 23, 2017 2:10 pm

by adilosnave

Be careful combining the DA 9000 crankset with the latest Di2 front derailleurs. They aren't made to work perfectly together. Different spacing.

pdlpsher1
Posts: 1413
Joined: Thu Jul 19, 2012 6:09 pm
Location: CO

by pdlpsher1

fromtrektocolnago wrote:
Mon Jan 01, 2018 6:24 pm
pdlpsher1 wrote:
Mon Jan 01, 2018 5:22 pm
fromtrektocolnago wrote:
Mon Jan 01, 2018 5:13 pm
Comparing di2 to mecanical is apples to oranges. preferences are personal. Really depends if you prefer the simplicity of mechanical or the techiness and shifting ease of di2. personally i like mechanical. electronic is anathema to what cycling should be in my book. others will of course differ. But in any response you are inviting that bias.
+1. I have both. And I could live with either system. I get occasional mis-shifts on my mechanical group but it's not like it ruined the fun of the ride.

I think what makes the decision so difficult for the OP is that he's comparing two systems that roughly costs the same, and each system has its pluses and minues :D
i was biking in france this sept and someone on a new di2 bike had a shifting failure nobody could figure out for a few hours. turns out a connector got loose. i'll stick with my 9000 mechanical. you can laugh at this , but this stuff does happen
I have to laugh because the same thing happened to me! The problem is that no one reads instructions manuals anymore. The Shimano instruction specifically tells you how to eliminate a loose connection. See the attached photo. This is the wrong way to install a wire. Shimano says you need to leave a little slack of wire just before it goes into the shifter. One day I was on a ride and hit a big pothole. All of a sudden I lost shifting on the RD. It turned out that the force of the impact cause the shifter to move 1-2mm, and that force was enough to pull the shifter away from the wire which was tightly taped to the handlebar. By leaving a little slack in the wire solved the problem for good. Unfortunately most Di2 bike are installed like the one shown in the photo.

Image

by Weenie


Post Reply
  • Similar Topics
    Replies
    Views
    Last post