Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    we are 138 Philatio's Avatar
    Join Date
    Jul 2005
    Location
    Knoxville, TN
    Posts
    676
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Short chain length on a 1x7

    I just put a new chain on my 1x7, and only measured once before I cut. I ended up one full link, one inch, shorter than my old chain. Shifting is fine.

    When I'm on my 26T cog, the largest in the back, I'm right on the edge of it not having a full "S bend" as it passes through the two derailer pulleys. I can take a picture but really my question is this: if shifting is fine, could there be any other problem with the chain being too short?

    I'm mainly worried about it wearing prematurely or something due to a higher tension, but it does seem that a single speed or fixed gear would be much "tighter" than this is.

    Also, and I sort of am convinced this is all in my head, it seems like there is more resistance now then with the old looser chain. I've swapped back and forth with the old chain and tried to measure the deflection change among other things, but everything seems very subjective.

  2. #2
    Senior Member
    Join Date
    Sep 2001
    Location
    Montreal
    My Bikes
    Peugeot Hybrid, Minelli Hybrid
    Posts
    6,521
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It should be OK if the jockey wheel cage is not against its hard stop. A new chain isnt that expensive, so may be worth the peace of mind while you are riding.

  3. #3
    Senior Member Bill Kapaun's Avatar
    Join Date
    Feb 2007
    Location
    Mid Willamette Valley, Orygun
    My Bikes
    86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
    Posts
    6,493
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    It sounds like you are OK. The main concern about being too short is when shifting to the largest cog and not having enough chain, causing the deraileur to bend in ways it was not designed.
    As long as you have "some slop", you're good.

  4. #4
    Has opinion, will express
    Join Date
    Jun 2003
    Posts
    11,703
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Actually, the problem is not so much the deraileur bending in ways it oughtn't, but total seizure of the transmission. If this isn't occuring in your biggest rear cog, then you really probably don't too much to worry about. Obviously, if the derailleur appears to be almost horizontal when in the big rear cog, you might be inviting trouble.

    How did you measure it? Chainring to big cog and add an extra complete link? Was the one-inch (actually half a link) difference because you used a joiner?
    Dream. Dare. Do.

  5. #5
    Senior Member
    Join Date
    Apr 2006
    Posts
    2,104
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    If you have a chain tool why not just add one link back in. It is not that difficult to do. Roger

  6. #6
    Senior Member tjspiel's Avatar
    Join Date
    Jun 2007
    Location
    Minneapolis
    Posts
    6,518
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Yeah, I've added links back in. If you end up with a stiff link, the chain tool I have (and I'm assuming any other decent one) has a separate place to put the chain so that tightening the tool a bit will loosen the link back up so it works as it should.
    If you're not riding with a psychedelic gecko on your shirt, you ARE having a substandard experience.

  7. #7
    biked well well biked's Avatar
    Join Date
    Jul 2005
    Posts
    6,712
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    You could break the chain and then check to see if it's sized correctly:

    http://www.sheldonbrown.com/derailer...ent.html#chain

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •