Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Can Di2 self adjust?

Old 09-26-12, 09:57 PM
  #1  
RoboCheme
Senior Member
Thread Starter
 
Join Date: Mar 2005
Location: Moraga, CA
Posts: 1,701

Bikes: 2008 Cervelo RS, 2011 Scott CR1 Elite, 2014 Volagi Liscio

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Can Di2 self adjust?

Back in March, I had my Rival group replaced with Ultegra Di2 and I'm very happy I did.

A few weeks ago I started to have a problems with some gear slipping. Basically, it wouldn't stay in a certain gear, and the problem wasn't consistent. Then it got worse; I was doing some hill repeats and the RD wouldn't stay in the biggest cog.

I took it back to the LBS, but the lead mechanic wasn't in and the other guys said that they don't touch Di2. It did jog my memory that the lead mechanic did show me how to make small adjustments to the RD. The Shimano written instructions didn't say anything about it, but Google came through (push and hold the battery check button and then hit the right shift buttons to adjust the RD up or down).

What's odd is that as soon as the five seconds were up, the RD starting moving up to the big cog and the light went out. I was turning the crank all this time. I never did get a chance to hit the shift buttons.

The positive slant on this is that the problem went away. So, when the RD started marching up the cassette it seems to have fixed itself. Is this normal behavior?
RoboCheme is offline  
Old 09-26-12, 10:43 PM
  #2  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 36,019

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 122 Post(s)
Tagged: 1 Thread(s)
Quoted: 4342 Post(s)
Likes: 0
Liked 1 Time in 1 Post
As you see there is self trimming built in, based on properly set limits, which the RD uses to "find" sprockets and calibrate itself. But it isn't magic, the other adjustments maus be done in advance then it can set the trim by itself.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 09-27-12, 06:02 AM
  #3  
reptilezs
Senior Member
 
Join Date: Sep 2004
Location: boston, ma
Posts: 2,897
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
by holding the button you put it into crash saver mode this reconnects the linkage from the servo to the derailer. you must make sure the hanger is straight before you do this or it can throw it into the spokes. to adjust the index all you need to do is hit the button for 1/2 a second or so
reptilezs is offline  
Old 09-27-12, 12:10 PM
  #4  
RoboCheme
Senior Member
Thread Starter
 
Join Date: Mar 2005
Location: Moraga, CA
Posts: 1,701

Bikes: 2008 Cervelo RS, 2011 Scott CR1 Elite, 2014 Volagi Liscio

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks, guys.
RoboCheme is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Swoop
Bicycle Mechanics
1
04-09-14 07:36 PM
reno327
Clydesdales/Athenas (200+ lb / 91+ kg)
6
03-27-09 11:52 AM
TwoTones
Commuting
23
06-10-08 09:59 PM
BluesDawg
Fifty Plus (50+)
12
10-24-06 10:39 AM

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.