"B" DER adjustment
12-29-04, 08:06 PM
#1
Member
Thread Starter
Join Date: Jan 2004
Location: atop Lookout Mt., Cloudland, Georgia
Posts: 47
Bikes: Treks 1000, 7600, 700
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
"B" DER adjustment
I just changed out my cassette(12X25) to a 11X28. My der jocky wheel seems to bounce and bump(against the cog) when in big ring and #11 cog. I had to move the "B" screw a good ways to correct the condition. Can I go too far, and is this the proper adjustment to make. Still new and learning. Thanks for any help.
12-29-04, 11:25 PM
#2
Klaatu barada nikto
Join Date: Sep 2004
Location: Southern NH
Posts: 1,453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
This is a good reference for your question:
https://www.sheldonbrown.com/derailer-adjustment.html
Section 4 addresses "B-index" and "chain length".
It's possible that you may need to add a link, or two, to your chain now that you have increased the size of the large cog.
https://www.sheldonbrown.com/derailer-adjustment.html
Section 4 addresses "B-index" and "chain length".
It's possible that you may need to add a link, or two, to your chain now that you have increased the size of the large cog.
12-30-04, 07:17 PM
#3
Member
Thread Starter
Join Date: Jan 2004
Location: atop Lookout Mt., Cloudland, Georgia
Posts: 47
Bikes: Treks 1000, 7600, 700
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Thanks Cascade, for the article, and information. Sounds like that's my problem. I'm in the middle of installing my Christmas presents. I have a new chain, and a 24 in chain ring for climbing. I will make that check as I install the chain ring. Thanks again.
12-30-04, 07:43 PM
#4
Senior Member
Join Date: Jan 2004
Posts: 9,428
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Originally Posted by Road Runner
I just changed out my cassette(12X25) to a 11X28. My der jocky wheel seems to bounce and bump(against the cog) when in big ring and #11 cog. I had to move the "B" screw a good ways to correct the condition. Can I go too far, and is this the proper adjustment to make. Still new and learning. Thanks for any help.
12-31-04, 06:54 AM
#5
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 643 Times
in
364 Posts
Originally Posted by Road Runner
I just changed out my cassette(12X25) to a 11X28. My der jocky wheel seems to bounce and bump(against the cog) when in big ring and #11 cog. I had to move the "B" screw a good ways to correct the condition. Can I go too far, and is this the proper adjustment to make. Still new and learning. Thanks for any help.
12-31-04, 06:27 PM
#6
Klaatu barada nikto
Join Date: Sep 2004
Location: Southern NH
Posts: 1,453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Originally Posted by Retro Grouch
Big ring and the 11 cog seems to me like a goofy gear combination to have this problem. I'd expect to find it in either the big/big or little/little combination. I'm wondering if you put on a new chain and didn't size it first. If that's the case, it's likely to be way too long and might cause the problem that you are describing.
Good thought. I never even considered that it might be too long. I assumed that when he was going to a bigger cog that, if anything, the problem would be too short.
