Single chain ring- dropping the chain...
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  1. #1
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    Single chain ring- dropping the chain...

    I am running a single 42T chain ring up front, and seem to be throwing the chain quite a bit (like once per ride). I have removed a few links, but it has not seemed to help. Does having a front derailleur really make that much of a difference in keeping the chain on??

    Anyone have any tips? I am using an FSA ring that is not ramped or anything... an orthodontist`s dream.

  2. #2
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    People use them all the time in races, the common denominator seems to be an outer ring guard, (store bought or made from an old chain ring) and a keeper on the inside, i.e. a third eye or a jumpstop. I have talked to a lot of people who experienced problems like yours, it's not uncommon

  3. #3
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    This is the first season of cross for me and I have only used a single ring set up. I have done 8 races and trained on the bike a bunch. I have not dropped the chain once. I am using a FSA chainguard on the outside with a 40T inner ring and Thirdeye chainwatcher. The chainwatcher is real close to the chain. I also think the the chain is shorter than if it had a big ring... not sure if that means anything. I have taken the bike on some really rough, bouncy stuff and still on there.

  4. #4
    PMC
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    Hey EP-
    Hope the move has gone well. Been following your progress loosely on the blog.

    Anyway - as others have already said, an outer chain guard and a 3rd eye keeper should be all it takes. I started racing CX this year and have been using that very set-up and have only had one dropped chain all year which happened when I took a digger on a run-up and wasn't on the bike.

    Good Luck and say Hello to L for me

  5. #5
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    N-Gear Jumpstop


  6. #6
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    Thanks-

    I caught your race at Powderhorn Park- it looked like fun- and a ton of work! I might have to look into it here. I cannot imagine what the road racing scene is like here... I am guessing it would be like racing in Minneapolis in early April- except all year long!

  7. #7
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    what is this 3rd eye keeper?
    Quote Originally Posted by Jesse D Smith
    You can always tell the guy that started his day with a proper shave versus the guy who started his day slappin' it to internet porn.

  8. #8
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    Just the brand name, the company originally made helmet mirrors, hence the name, picture:

    http://www.rei.com/product/9610812.htm

    I liked the looks of this one a little better, third eye is pretty basic:

    http://www.gvtc.com/~ngear/whatis.html

  9. #9
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    The 3rd eye hasn't helped me a bit. I've dropped my chain no fewer than 10 times this season even with the 3rd eye and an outer guard. Everybody has recommended the N-Gear Jump Stop. I'm ordering one of these.

  10. #10
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    Quote Originally Posted by FondriestFan
    The 3rd eye hasn't helped me a bit. I've dropped my chain no fewer than 10 times this season even with the 3rd eye and an outer guard. Everybody has recommended the N-Gear Jump Stop. I'm ordering one of these.
    That is my issue- it is just as likely to drop over the outer side of the ring...

  11. #11
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    You could consider the Rohloff Chain Guide; it's basically a deraillieur cage mounted to the frame






    Quote Originally Posted by filtersweep
    I am running a single 42T chain ring up front, and seem to be throwing the chain quite a bit (like once per ride). I have removed a few links, but it has not seemed to help. Does having a front derailleur really make that much of a difference in keeping the chain on??

    Anyone have any tips? I am using an FSA ring that is not ramped or anything... an orthodontist`s dream.

  12. #12
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    If you are dropping your chain on the outside with a guard there, it is likely your chain length. Can you post pics? What exactly is your setup in terms of gearing? Are you using a long cage rear mech? This could be part of the problem.

  13. #13
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    I had the same problems

    I ran a 42 ring with an outside chainguard and inside 3rd eye for a while, but could still bounce the chain off to the inside every now and then. I shortened the chain as much as I was comfortable with (draped chain over front ring and largest cog on back without going through the derailleur, added one link to where the chain joined), which helped, but the problem was still there. Finally, I replaced the rear derailleur, which was about 5 years old, and that really fixed things. However, I decided it just wasn't worth it in the end, and recently went back to a double-ring setup. I get lower gears, the front derailleur can push the chain back on from either side, and the weight difference really wasn't much. I don't think the chain watcher you use makes a big difference -- if the chain comes off the ring and drapes over the bottom bracket shell, it will just hang from the chainwatcher, regardless of who makes it or what design it is. The single ring looks cool, but in the end it was just a hassle that I didn't need.

    John

    Quote Originally Posted by filtersweep
    I am running a single 42T chain ring up front, and seem to be throwing the chain quite a bit (like once per ride). I have removed a few links, but it has not seemed to help. Does having a front derailleur really make that much of a difference in keeping the chain on??

    Anyone have any tips? I am using an FSA ring that is not ramped or anything... an orthodontist`s dream.

  14. #14
    More Cowbell!
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    Quote Originally Posted by jmeerse
    I ran a 42 ring with an outside chainguard and inside 3rd eye for a while, but could still bounce the chain off to the inside every now and then.
    The real utility of the 3rd eye or jump stop is not absolutely keeping the chain on. It's that you can pedal the chain back on within a pedal stroke.
    Pro rep, yo!

  15. #15
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    Hey, I've been having the same problem. I've got a 42t chainring on the front with a chainring guard on the outside and a 3rd Eye on the inside. I've shortened the chain as much as reasonable, cleaned the rear deraileur well, cleaned the chain well, and had it checked out in case I was missing something obvious. I rode last night and tried to get it to jump, but it stayed on. If this persists, or if I find out something remarkable, I'll pass it on to y'all.

    Six days 'til Hendersonville (North Carolina UCI races)!

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