Strange DR adjustment problem
#1
Senior Member
Thread Starter
Join Date: Aug 2012
Posts: 209
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Likes: 0
Liked 12 Times
in
8 Posts
Strange DR adjustment problem
My rear DR is doing something new to me. I have an Ultegra 6800 group set. I noticed it was having trouble shifting from the 2nd to 3rd biggest rear cogs when in the big chainring. It wants to stay in the bigger fear (under-shifting?). Other shifts worked fine, and the 2-3 shift works well in the small chainring. If I adjust the barrel nut in the shift cable to fix this, then the bike over-shifts at the small end of the cog set 8-9, 9-10. 10-11 works fine, probably because of the limit screw. Any ideas how to adjust this back to where it should be?
#2
Senior Member
Join Date: Mar 2012
Location: Minnesota
Posts: 1,968
Bikes: '09 Trek 2.1 * '75 Sekine * 2010 Raleigh Talus 8.0 * '90 Giant Mtb * Raleigh M20 * Fuji Nevada mtb
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
If I understand correctly, the problem is going from the larger cogs to the smaller cogs of your cassette? So as you release cable tension by shifting, allowing the RD to return to low-normal, it tends to not move. That indicates binding cables as a first, and easiest guess.
__________________
FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
#3
Senior Member
Join Date: Jun 2002
Location: Montreal, Quebec
Posts: 5,869
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1792 Post(s)
Liked 1,671 Times
in
955 Posts
If I understand correctly, the problem is going from the larger cogs to the smaller cogs of your cassette? So as you release cable tension by shifting, allowing the RD to return to low-normal, it tends to not move. That indicates binding cables as a first, and easiest guess.
#4
Senior Member
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1572 Post(s)
Liked 642 Times
in
363 Posts
Cable friction would be my first guess too.
If I were working on your bike at home, the FIRST thing that I would check would be the derailleur hanger alignment with my gauge. It doesn't have to be very far off to cause the kind of problem that you are describing. Hanger alignment only takes a couple of minutes to check and, even if it's spot on, it's good to eliminate that as the possible source of your shifting problem.
If I were working on your bike at home, the FIRST thing that I would check would be the derailleur hanger alignment with my gauge. It doesn't have to be very far off to cause the kind of problem that you are describing. Hanger alignment only takes a couple of minutes to check and, even if it's spot on, it's good to eliminate that as the possible source of your shifting problem.
__________________
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
#5
Senior Member
Thread Starter
Join Date: Aug 2012
Posts: 209
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Likes: 0
Liked 12 Times
in
8 Posts
Thanks for the replies. I loosened the cable, lubed it, and reset it. Feels much better. The cable itself only has about 2200 miles and was new in December, so it's not that old, but it certainly could be dirty.
#6
Senior Member
Join Date: Jun 2002
Location: Montreal, Quebec
Posts: 5,869
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1792 Post(s)
Liked 1,671 Times
in
955 Posts
The cable may have been changed, but was it the same as the original equipment one? I ask because this is something that is becoming increasingly important.The coating on Shimano cables for 11 speed drivetrains Is partially what solved the problems that plagued 10 speed shifters with cables routed under the bar tape
#7
Senior Member
Thread Starter
Join Date: Aug 2012
Posts: 209
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Likes: 0
Liked 12 Times
in
8 Posts
That's a good question. I will need to ask my lbs. they built up the bike using my old parts on a new frame in December. I know they used new housings and cables, but I just assumed they were good stuff. They have a good rep and have never steered me wrong, so I suspect they used high quality stuff. The cables are internally routed, not sure if that matters.
#8
Senior Member
Join Date: Mar 2012
Location: Minnesota
Posts: 1,968
Bikes: '09 Trek 2.1 * '75 Sekine * 2010 Raleigh Talus 8.0 * '90 Giant Mtb * Raleigh M20 * Fuji Nevada mtb
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Cable friction would be my first guess too.
If I were working on your bike at home, the FIRST thing that I would check would be the derailleur hanger alignment with my gauge. It doesn't have to be very far off to cause the kind of problem that you are describing. Hanger alignment only takes a couple of minutes to check and, even if it's spot on, it's good to eliminate that as the possible source of your shifting problem.
If I were working on your bike at home, the FIRST thing that I would check would be the derailleur hanger alignment with my gauge. It doesn't have to be very far off to cause the kind of problem that you are describing. Hanger alignment only takes a couple of minutes to check and, even if it's spot on, it's good to eliminate that as the possible source of your shifting problem.
__________________
FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.