Advertise on Bikeforums.net



User Tag List

Results 1 to 4 of 4
  1. #1
    Cool Guy Training.Wheels's Avatar
    Join Date
    Jul 2012
    Location
    San Jose, CA
    My Bikes
    Jamis Sputnik, Leader 722 Heritage Edition, Brompton, Bianchi Via Nirone, Robinson SST, Diamondback Sorrento
    Posts
    788
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    My chain slipped off on my 3 speed Brompton - reason?

    So I was on 8 miles in on a my 16 mile ride, I stood up on the pedals to accelerate from a stop then *metals crunching* the chain came off my Brommie. I think I was shifting, but I'm not entirely sure. I didn't think it was a problem with internal hubs since they don't use derailleurs. I'm around the time when I need my 100 mile tune-up. Do you guys think this is the problem?
    http://www.pedalroom.com/member/J-Dogg

  2. #2
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    39,074
    Mentioned
    20 Post(s)
    Tagged
    0 Thread(s)
    on site inspection is best..

    not many clues offered... front or back?

    bringing it in for that 100 mile tuneup is the solution, not the problem..

  3. #3
    Banned. folder fanatic's Avatar
    Join Date
    May 2005
    Location
    Anti Social Media-Land
    Posts
    3,076
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    A few years after purchase, Chain Slipping Off was the only major problem I had with my own 3 speed Brompton as well for the almost 7 years I had have it. I simply slipped back on as I was on the road, not at home. When I went home, I thoroughly cleaned the chain & oiled it again with a little squirt of oil. I examined any part of the drivetrain for damage (there was/is none) & especially the chain tensioner adjustment for possible adjustments and/or damage. There was none there as well. So far, I have no repeats of this problem. If the chain does continue to jump off, I would visit your Brompton dealer.

  4. #4
    Senior Member Ozonation's Avatar
    Join Date
    Apr 2012
    Location
    Ontario, Canada
    My Bikes
    Rivendell Sam Hillborne DTT in Awesome Green; Brompton M6R (reduced gearing) in Sage Green; GT Timberline Hybrid (10 years old!)
    Posts
    892
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I was pedaling hard, had just shifted, and then hit a bump hard. I knew it was too hard too. Chain slipped off. It was the only time it happened. Doesn't sound too dissimilar to what you went through.
    Rivendell Sam Hillborne and Hunqapillar; Brompton M6R Sage Green; Salsa Mukluk 3 FAT Bike; Nerdy Academic; Nikonian; Wing Chun; and a Patridge in a Pear Tree.

Posting Permissions

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