Is this too short chain?
03-07-20, 07:42 PM
#1
Senior Member
Thread Starter
Is this too short chain?
I just finished building my Nishiki Tri-A with 105 R7000 and have an issue.
50/34T compact on front and CS-HG700 11-34 cassette on rear.
When I have the big-big crossed and backpedal the chain drops to the 30 or 27 on the cassette.
Forward pedaling there is no issue.
Another thing I noticed is the RD-R7000 has that extra arm that puts the derailleur back of the dropout hanger.
Where the derailleur hangs in the extra arm there is a washer and the derailleur extension itself.
Is that there so you can move the derailleur body outside or outside by about 2 mm?
Just wondering because when I am on big-big, the pull to outside from the chain seems stronger than
the cable trying to bring the derailleur closer to the bike, and don't get to max position.
50/34T compact on front and CS-HG700 11-34 cassette on rear.
When I have the big-big crossed and backpedal the chain drops to the 30 or 27 on the cassette.
Forward pedaling there is no issue.
Another thing I noticed is the RD-R7000 has that extra arm that puts the derailleur back of the dropout hanger.
Where the derailleur hangs in the extra arm there is a washer and the derailleur extension itself.
Is that there so you can move the derailleur body outside or outside by about 2 mm?
Just wondering because when I am on big-big, the pull to outside from the chain seems stronger than
the cable trying to bring the derailleur closer to the bike, and don't get to max position.
03-07-20, 08:41 PM
#2
Senior Member
Join Date: Jun 2002
Location: Montreal, Quebec
Posts: 5,925
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1819 Post(s)
Liked 1,693 Times
in
974 Posts
Don't backpedal when using the big, big combination. Chain length has nothing to do with how badly this works out
03-07-20, 09:11 PM
#3
Really Old Senior Member
You expect to cross chain an 11 speed cassette and not have issues?
Since you didn't tear off the RDER, the chain probably isn't too short.
This is my in situ quick method to check for extra chain length.
Typically you want at least 1" of excess, but < 2".
Since you didn't tear off the RDER, the chain probably isn't too short.
This is my in situ quick method to check for extra chain length.
Typically you want at least 1" of excess, but < 2".
03-08-20, 08:08 AM
#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 643 Times
in
364 Posts
If you can shift easily into your big/big and the chain derails by itself when you b backpedal, your chain isn't too short.
I'd check your derailleur adjustment and your derailleur hanger alignment. If everything is lined up perfectly, you should be able to backpedal without the chain derailling.
I'd check your derailleur adjustment and your derailleur hanger alignment. If everything is lined up perfectly, you should be able to backpedal without the chain derailling.
__________________
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.
03-08-20, 08:30 AM
#5
Senior Member
Join Date: Jan 2011
Posts: 2,977
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 1638 Post(s)
Liked 741 Times
in
495 Posts
IME, the length of the chain stays has an affect on backpedaling when the drive line is set up properly.
__________________
nine mile skid on a ten mile ride
nine mile skid on a ten mile ride
