Road Cycling ďIt is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.Ē -- Ernest Hemingway

Di2 Shifting Speeds

Old 01-12-19, 02:58 PM
  #1  
JasonD67
Senior Member
Thread Starter
 
Join Date: Jul 2018
Location: Annapolis, MD
Posts: 101

Bikes: BMC Teammachine SLR02 Disc, Cannondale CAAD 4

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 47 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Di2 Shifting Speeds

I'm about to get my first new bike in about 20 years and it'll have Di2. I notice in the app setup for Di2 you can adjust the shift speed from "Slow" to "Very Fast". My question is, why wouldn't you want this set on anything but very fast? Do you lose something (battery life maybe?) by selecting the fastest shift speed?
JasonD67 is offline  
Old 01-12-19, 03:19 PM
  #2  
Steve B.
Senior Member
 
Join Date: Jul 2007
Location: South shore, L.I., NY
Posts: 3,147

Bikes: Flyxii FR322, Soma Smoothie, Miyata City Liner, Specialized FSR Comp, Fuji Professional

Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 1027 Post(s)
Likes: 0
Liked 5 Times in 5 Posts
As a one year user of Di2 I had the same question. One great function of electronic is it’s faster than mechanical, so why slow it down. Curious if there’s a technical advantage to slower.
Steve B. is offline  
Old 01-12-19, 04:19 PM
  #3  
Abe_Froman
Senior Member
 
Abe_Froman's Avatar
 
Join Date: Aug 2016
Location: Chicago
Posts: 2,485

Bikes: Marin Four Corners, 1960's Schwinn Racer in middle of restoration, mid 70s Motobecane Grand Touring, various other heaps.

Mentioned: 48 Post(s)
Tagged: 0 Thread(s)
Quoted: 8735 Post(s)
Likes: 0
Liked 11 Times in 10 Posts
I have no experience with DI2, but I can imagine that if you tend to spin the cranks more slowly, you may not want the chain to move over quite as quickly. Could cause more choppy shifting if the chain moves too fast laterally relative to number of links going by?
Abe_Froman is online now  
Old 01-12-19, 04:30 PM
  #4  
Seattle Forrest
Senior Member
 
Seattle Forrest's Avatar
 
Join Date: Mar 2010
Location: Seattle, WA
Posts: 18,789
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 7449 Post(s)
Liked 66 Times in 38 Posts
More battery usage and more chance of a missed shift. I've had mine on fast for at least a year and have nothing to complain about.
Seattle Forrest is offline  
Old 01-12-19, 05:17 PM
  #5  
JasonD67
Senior Member
Thread Starter
 
Join Date: Jul 2018
Location: Annapolis, MD
Posts: 101

Bikes: BMC Teammachine SLR02 Disc, Cannondale CAAD 4

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 47 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Seattle Forrest View Post
More battery usage and more chance of a missed shift. I've had mine on fast for at least a year and have nothing to complain about.
Would you say it was less reliable on Very Fast?
JasonD67 is offline  
Old 01-12-19, 05:34 PM
  #6  
logical
______
 
logical's Avatar
 
Join Date: Apr 2016
Posts: 129
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 75 Post(s)
Liked 0 Times in 0 Posts
Shifting speed is how fast it moves up and down the cogs when holding the shifter down. It will move down/up faster at the expense of possibly dropping the chain. It does not affect shifting one gear.
logical is offline  
Old 01-12-19, 05:53 PM
  #7  
rm -rf
don't try this at home.
 
rm -rf's Avatar
 
Join Date: Jan 2006
Location: N. KY
Posts: 5,037
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 605 Post(s)
Likes: 0
Liked 3 Times in 2 Posts
I never switched from the normal shift speed. The shifts seem to be instantaneous, so I didn't see the need to try "fast".

From the 6870 Dealer Manual:
(From the notes on setting to fast or very fast shifting speeds: )
Over-shifting occurs easily.
If the rotation speed of the crank is low, the chain will be unable to follow the movement of the rear derailleur. The chain may therefore slip over the tip of the cassette sprocket teeth.
They suggest using high cadences with the fast shift settings. This could be good for racing.

Shift 3 cogs on long press
Change the settings from "shift the whole cassette" to "shift 3 gears". (This appears to be called "multi shift mode" in the e-tube manual.)
The semi-syncro settings weren't available when I got the Di2. I've never felt the need to use semi-syncro up since it's been an option.

A "long press", which is holding a button for 1/2 second or longer, will shift 3 positions in the cassette.
At the base of a hill:
Hold down both bottom buttons. It shifts to the small chain ring, and to three smaller cogs. I often shift one more cog manually to get the right cadence.
(It's easy to remember, too.)

Over the top of the hill:
Hold down both top buttons. That's the big chainring and three larger cogs.

I use the long press quite often, even without shifting the chain ring.

Last edited by rm -rf; 01-12-19 at 05:59 PM.
rm -rf is offline  
Old 01-12-19, 07:18 PM
  #8  
JasonD67
Senior Member
Thread Starter
 
Join Date: Jul 2018
Location: Annapolis, MD
Posts: 101

Bikes: BMC Teammachine SLR02 Disc, Cannondale CAAD 4

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 47 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by logical View Post
Shifting speed is how fast it moves up and down the cogs when holding the shifter down. It will move down/up faster at the expense of possibly dropping the chain. It does not affect shifting one gear.
Ahh, thatís good to know. So shifting from one gear to the next is always at the same speed.
JasonD67 is offline  
Old 01-12-19, 07:58 PM
  #9  
logical
______
 
logical's Avatar
 
Join Date: Apr 2016
Posts: 129
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 75 Post(s)
Liked 0 Times in 0 Posts
Originally Posted by JasonD67 View Post


Ahh, thatís good to know. So shifting from one gear to the next is always at the same speed.
Yup
logical is offline  
Old 01-12-19, 08:41 PM
  #10  
Sojodave
Senior Member
 
Sojodave's Avatar
 
Join Date: Apr 2015
Location: Utah
Posts: 366

Bikes: Fezzari Fore CR3 Di2

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 113 Post(s)
Likes: 0
Liked 1 Time in 1 Post
You should try lucicrous speed

Sojodave is offline  
Old 01-12-19, 10:22 PM
  #11  
Seattle Forrest
Senior Member
 
Seattle Forrest's Avatar
 
Join Date: Mar 2010
Location: Seattle, WA
Posts: 18,789
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 7449 Post(s)
Liked 66 Times in 38 Posts
Originally Posted by logical View Post
Shifting speed is how fast it moves up and down the cogs when holding the shifter down. It will move down/up faster at the expense of possibly dropping the chain. It does not affect shifting one gear.
Thanks for posting this clarification. This is exactly right, spot on.

I have mine set up to be able to shift all the way across the cassette if I hold the button down. That's what it's referring to not single shifts.
Seattle Forrest is offline  
Old 01-12-19, 10:24 PM
  #12  
Seattle Forrest
Senior Member
 
Seattle Forrest's Avatar
 
Join Date: Mar 2010
Location: Seattle, WA
Posts: 18,789
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 7449 Post(s)
Liked 66 Times in 38 Posts
Originally Posted by JasonD67 View Post
Would you say it was less reliable on Very Fast?
I've never tried. I want as fast as I can get, but took it down a notch after reading the warning in the software.

I would offer to give it a try and report back, but I had my first ride since 12/5 today. I started a job with a schedule that makes it hard, and I'd rather ski on weekends.
Seattle Forrest is offline  
Old 01-12-19, 10:29 PM
  #13  
Seattle Forrest
Senior Member
 
Seattle Forrest's Avatar
 
Join Date: Mar 2010
Location: Seattle, WA
Posts: 18,789
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 7449 Post(s)
Liked 66 Times in 38 Posts
One more thing. You didn't ask, but I've been doing this wrong since the beginning, would like to save you the same mistake.

If you have a Garmin (or probably any computer that will talk to your drivetrain), it will count shifts for you, plus regular stuff like show where the battery's at and what gear you're in. I shift a lot more after getting used to how fast and drama free it is, which is a pretty good sign this was worth it for me. Anyway, the computer has to connect first, and that won't happen until you wake the system up (by shifting). Don't shift when the cranks aren't moving. Instead, if you care about this stuff, shift the front into whichever ring it's already on. I think it's potentially about longevity of the derailleurs.
Seattle Forrest is offline  
Old 01-12-19, 11:23 PM
  #14  
JasonD67
Senior Member
Thread Starter
 
Join Date: Jul 2018
Location: Annapolis, MD
Posts: 101

Bikes: BMC Teammachine SLR02 Disc, Cannondale CAAD 4

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 47 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Seattle Forrest View Post
One more thing. You didn't ask, but I've been doing this wrong since the beginning, would like to save you the same mistake.

If you have a Garmin (or probably any computer that will talk to your drivetrain), it will count shifts for you, plus regular stuff like show where the battery's at and what gear you're in. I shift a lot more after getting used to how fast and drama free it is, which is a pretty good sign this was worth it for me. Anyway, the computer has to connect first, and that won't happen until you wake the system up (by shifting). Don't shift when the cranks aren't moving. Instead, if you care about this stuff, shift the front into whichever ring it's already on. I think it's potentially about longevity of the derailleurs.
I have a Bolt and Iím getting D Fly added to the Di2 system so this will be useful, thanks!
JasonD67 is offline  
Old 01-13-19, 09:25 AM
  #15  
waters60
Senior Member
 
waters60's Avatar
 
Join Date: Sep 2010
Posts: 291
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 48 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Speaking of Di2, I finally relented and had my first roller session of the year, using Sufferfest. Lots of wireless communication going on, with cadence, HR, speed and Sufferfest and my Bolt taking in information. I found that shifting to the large chainring was sketchy if not nonexistent, unlike on the road where it is flawless. Anyone else seeing this? I suspect all of the wireless communication is at fault.
waters60 is offline  
Old 01-13-19, 03:09 PM
  #16  
JohnJ80
Senior Member
 
Join Date: Feb 2011
Location: Minnesota
Posts: 3,975

Bikes: N+1=5

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 520 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Originally Posted by rm -rf View Post
I never switched from the normal shift speed. The shifts seem to be instantaneous, so I didn't see the need to try "fast".

From the 6870 Dealer Manual:
(From the notes on setting to fast or very fast shifting speeds: )
Over-shifting occurs easily.
If the rotation speed of the crank is low, the chain will be unable to follow the movement of the rear derailleur. The chain may therefore slip over the tip of the cassette sprocket teeth.
They suggest using high cadences with the fast shift settings. This could be good for racing.

Shift 3 cogs on long press
Change the settings from "shift the whole cassette" to "shift 3 gears". (This appears to be called "multi shift mode" in the e-tube manual.)
The semi-syncro settings weren't available when I got the Di2. I've never felt the need to use semi-syncro up since it's been an option.

A "long press", which is holding a button for 1/2 second or longer, will shift 3 positions in the cassette.
At the base of a hill:
Hold down both bottom buttons. It shifts to the small chain ring, and to three smaller cogs. I often shift one more cog manually to get the right cadence.
(It's easy to remember, too.)

Over the top of the hill:
Hold down both top buttons. That's the big chainring and three larger cogs.

I use the long press quite often, even without shifting the chain ring.
Iíve had mine set on fast ever since I got the bike 3 years ago. I have a relatively fast cadence at around 85-95rpm. I donít think Iíve had a missed shift in thousands of miles. Thanks for posting this, now I think know why. At that cadence, I didnít notice much difference in shifting speed when I changed the settings in software. The battery lasts for an amazingly long time such that I donít think it would matter much to me for battery consumption.

I have mine set to shift 3 cogs on a log press. This way when I approach a hill, Iíll long press both the small paddles. That shifts me down to the small chainring and up 3 cogs on the cassette putting me in approximately the same position in gear-inches as I was before the shift but now able to shift down more easily. I do the opposite on beginning a descent.

I also have an eTap bike that Iíve now ridden for 1.5 seasons. I have to say, I find that pretty impressive system. I think if I were to build a new bike, thatís probably what I would put on it. All that said, Iím done with pure mech bikes. I love electronic shifting.

J.
JohnJ80 is offline  
Old 01-14-19, 10:26 AM
  #17  
jadocs
Senior Member
 
jadocs's Avatar
 
Join Date: Jul 2018
Location: USA
Posts: 477

Bikes: Litespeed T2 Disc, Fondirest P4 Carbon, Fuji Cross 2.0, Specialized Fatboy

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 192 Post(s)
Liked 11 Times in 8 Posts
Originally Posted by waters60 View Post
Speaking of Di2, I finally relented and had my first roller session of the year, using Sufferfest. Lots of wireless communication going on, with cadence, HR, speed and Sufferfest and my Bolt taking in information. I found that shifting to the large chainring was sketchy if not nonexistent, unlike on the road where it is flawless. Anyone else seeing this? I suspect all of the wireless communication is at fault.
I have experienced this on a mechanical, but that had to do with how my weight was distributed on the rollers and how I shifted on the road vs. the rollers, if that makes sense. Not sure how this would be an issue with Di2 unless your pedal stroke is somehow different on the rollers vs. riding outside on the road.
jadocs is offline  
Old 01-14-19, 04:32 PM
  #18  
NoWhammies
Senior Member
 
NoWhammies's Avatar
 
Join Date: Jul 2017
Location: Vancouver, BC
Posts: 606

Bikes: Argon 18 Gallium, BH G7

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 270 Post(s)
Liked 6 Times in 4 Posts
Wow. I had no idea this was even an option. Since my LBS setup my bike I have never even looked at the Di2 unit. That said my bike is shifting as it should (although there is one hard shift point in there somewhere) so I'm tempted to leave well enough alone. Knowing me I'll tweak it somehow and make the whole Di2 system worse.
NoWhammies is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.