Advertise on Bikeforums.net



User Tag List

Results 1 to 9 of 9
  1. #1
    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
    981
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Brompton - chain skipping or slipping?

    I was heading to work, got about a third of the way there, when I noticed my chain was either slipping or skipping. It seemed as if it would engage only every other stroke. I thought this was odd given that when I started riding, it was fine and the problem didn't appear until about 5 minutes in.

    I can't see anything obviously wrong. My first thought was that the tensioner arm wasn't engaging so that the chain was too slack to properly engage while pedaling. It looked at a bit of a shallow angle compared to my wife's Brompton when I got home. However, I can't be sure.

    I had the bike tuned up about a month ago at what I considered the best bike shop in town, and since then, I've ridden it a number of times without incident.

    Any idea what's going on? I'm hoping it's not the IGH itself...
    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.

  2. #2
    LET'S ROLL 1nterceptor's Avatar
    Join Date
    Nov 2009
    Location
    WEST NEW YORK, USA
    My Bikes
    2013 Scott CR1 Pro carbon, 2013 Brompton S6L-X titanium, 2013 Citizen Tokyo steel
    Posts
    3,329
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    Try tightening the adjustment for the IGH cable a bit.
    How old/many miles on your chain and rear sprocket(s)?

  3. #3
    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
    981
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by 1nterceptor View Post
    Try tightening the adjustment for the IGH cable a bit.
    How old/many miles on your chain and rear sprocket(s)?
    Adjusting the IGH occurred to me too. I'll give it a try, although I recall when I changed the back wheel once and I had to adjust the IGH it felt more as if it just would change too easily or not at all, as opposed to the skipping/slippage.

    The Brompton is about 3 years old, and I'd say... maybe a 1000 km? I use it semi-regularly, but the distances tend to be less than 10 km.
    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.

  4. #4
    LET'S ROLL 1nterceptor's Avatar
    Join Date
    Nov 2009
    Location
    WEST NEW YORK, USA
    My Bikes
    2013 Scott CR1 Pro carbon, 2013 Brompton S6L-X titanium, 2013 Citizen Tokyo steel
    Posts
    3,329
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    The IGH cable stretches over time; it's possible that if the cable is too slack for
    the IGH to go in and out position/gear. Since this doesn't cost anything; I'd try
    this first.

    Do you have a chain wear measuring tool? Or maybe ask a shop to do it, there
    should be no charge.

    Edit: Your mileage is not a lot, but how often you ride in the rain and/or snow
    slush will have an affect on wear.
    Last edited by 1nterceptor; 04-20-15 at 11:49 AM.

  5. #5
    jur
    jur is online now
    Senior Member
    Join Date
    May 2005
    Posts
    6,459
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    Sounds exactly like a stiff chain link to me. Look at it while spinning back the cranks. You should see something jogging the tensioner.

    If it is that, try to loosen the stiff joint by grabbing the chain firmly in the hands either side of the stiff joint, and flexing the chain to and fro perpendicular to the normal direction,the stiff joint under the thumbs.

  6. #6
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    7,569
    Mentioned
    71 Post(s)
    Tagged
    0 Thread(s)
    You mastered the 'put it in second and adjust the cable so the shoulder of the rod that goes in to the axle is even with the end of the axle, indication'. Yet?

    Its Aka 'the indicator chain' because of that. may be needed after that wheel change.. you did have to unscrew the cable, to get the wheel Out.

    BITD we used the upper portion of the chain tool to gently spread out the side plates of stiff links .. it was safer when the pins were longer than the chain was wide.
    Last edited by fietsbob; 04-20-15 at 03:05 PM.

  7. #7
    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
    981
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by 1nterceptor View Post
    The IGH cable stretches over time; it's possible that if the cable is too slack for the IGH to go in and out position/gear. Since this doesn't cost anything; I'd try
    this first.

    Do you have a chain wear measuring tool? Or maybe ask a shop to do it, there
    should be no charge.

    Edit: Your mileage is not a lot, but how often you ride in the rain and/or snow
    slush will have an affect on wear.
    Yes, it's been through some mud, dirt, and other gunk. I don't ride many miles, but when I do ride it, I push it pretty hard, especially if I've taken it on trip.

    Quote Originally Posted by jur View Post
    Sounds exactly like a stiff chain link to me. Look at it while spinning back the cranks. You should see something jogging the tensioner.

    If it is that, try to loosen the stiff joint by grabbing the chain firmly in the hands either side of the stiff joint, and flexing the chain to and fro perpendicular to the normal direction,the stiff joint under the thumbs.
    A colleague of mine at work who's a lot more knowledgeable than me said the same thing. I'm going to take a look when I get home.

    Quote Originally Posted by fietsbob View Post
    You mastered the 'put it in second and adjust the cable so the shoulder of the rod that goes in to the axle is even with the end of the axle indication Yet?

    Its Aka 'the indicator chain' because of that.
    I've done this before... don't know if I've "mastered it" per se. But I'll have a look tonight.
    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.

  8. #8
    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
    981
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Problem solved!

    Embarrassingly, a twig had wrapped around the rear cog. It had done so tightly that I couldn't tell what it was at first. Part of it had embedded between the teeth so the chain would not engage.

    Removed it, cleaned up the gears, and it works great now!
    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.

  9. #9
    jur
    jur is online now
    Senior Member
    Join Date
    May 2005
    Posts
    6,459
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    Now I am embarrassed. Exactly the same has happened to me, but I forgot.

Posting Permissions

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