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Brompton chain coming offage problem

Discussion in 'Tandem and Other Bikes' started by Yellow Fang, 8 Feb 2008.

  1. Yellow Fang

    Yellow Fang Guru

    Location:
    Reading
    I have a problem with my Brompton: the chain tends to come off when I unfold it. Has anyone else ever had this problem, and if so, how did they solve it?
     
  2. ChrisKH

    ChrisKH Shorts Adjustment Expert

    Location:
    Essex
    I have never had this directly - which model do you have and how many miles has the chain done?
     
  3. OP
    OP
    Yellow Fang

    Yellow Fang Guru

    Location:
    Reading
    I have an L3. I don't think the chain is all that worn. It was replaced about six months ago and it hasn't done an awful lot of mileage since.
     
  4. stevew

    stevew Well-Known Member

    Location:
    Orpington
    Check the chain tensioner's spring tension to see if it moves freely but with a good amount of tension. If it's sticky it may not be following the chain when the bike is folded.
     
  5. rob_mcp

    rob_mcp New Member

    I borrowed one which did this - but never got to the bottom of it. I suspect that stevew may be right It seemed particularly prone to this if I knocked the pedal back while unfolding it
    My own has never done this
     
  6. OP
    OP
    Yellow Fang

    Yellow Fang Guru

    Location:
    Reading
    It hasn't been doing it recently, but I haven't cycled it all that much. I suspect that either the chainwheel or the derailleur wasn't screwed in very tightly.