chain keeps dropping on 1x1- Mtbr.com
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  1. #1
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    chain keeps dropping on 1x1

    hi there,

    I experience some problems on my Surly 1x1. It is now the second time that my chain dropped while out of the saddle and pumping uphill on a rocky trail (with me going over the bar and really hurting my knee due to the sudden loss of pedal resistance). I donŽt know why this keeps happening, I have my chain quit nicely tensed (in fact, tensioning it any more would result in a big increase in resistance). I am using a standard 32th chainring that came with my slx cranks (so nothing SS specific), can this be the problem?

    Thanks,

    BJ

  2. #2
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    Check that your chainline is correct. And replacing that chainring with ss-specific at least wouldn't hurt.

    Also check your frames rear end and/or bb-area of cracks or dents that might increase frames bending while you hammer. Or if you are so powerfull rider, just get more stiffer frame.

  3. #3
    Bro Mountainbiker
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    I have had issues dropping my chain accelerating out of the saddle and resisting the pedals on my fixed gear mtn bike. The frame is very flexy and it causes the chain to become slack. I have to run a front derailleur as a chain guide and a singuator in the rear to take up the extra slack. You may have to consider a chain tentioner
    Raised in a Chicken-Coop by Chickens

  4. #4
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    Get a SS specific chainring and SS cog (both un-ramped) along with an 8spd or SS specific chain. From that point you shouldn't have any issues as long as you have proper tension and a good chain line.

    I once tore apart a road cassette thinking I could use them as SS cogs. Worked ok until I stood and laid down some torque. With torque applied it was the same scenario that you experienced.

  5. #5
    One Colorful Rider
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    Quote Originally Posted by brettsportler View Post
    hi there,
    I am using a standard 32th chainring that came with my slx cranks (so nothing SS specific), can this be the problem?

    Thanks,

    BJ
    What Crankset is this A Race Face SIX?

  6. #6
    nothing to see here
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    Is the chain coming off the front or rear? Most likely, it will be the rear, because as the chain approaches the sprocket it has very little tension, allowing the links to ride up and over the teeth on the sprocket.

    1) Try standing still on the bike with the brakes on, and apply as much torque as you can. Get a mate to see how much the chain moves down. This will identify frame flex.

    2) Use this link to check your chainline also.

    3) Remove the rear wheel and check for bearing play in the freehub. Replace the wheel and check for bearing play in the wheel hub.

    4) Single speed specific rear sprockets with good high tooth profiles are more important when considering chain dropping than the front chainrings are. Having said that, an out of round or off centre chainring can cause excessive cyclic chain sagging, which does increase the probability of chain dropping.
    I see hills.

    I want to climb them.

  7. #7
    nothing to see here
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    Quote Originally Posted by Normbilt View Post
    What Crankset is this A Race Face SIX?
    Shimano SLX
    I see hills.

    I want to climb them.

  8. #8
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    If your chainline is good check all the teeth on your front chainring a bent tooth can easily derail your chain. And make sure your chainring is true. but ss specific chainring will help aswell check for bent teeth or bent chainring though

  9. #9
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    dear all,

    thanks very much for your replies. IŽll start with the cheapest option, that is getting a SS rear cog. Hope that will do it, if not iŽll have to opt for a new front ring. However, I never thought that frame flex could be such an issue...

    best,

    BJ

  10. #10
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    do you have a surly tugnut chain tensioner in drive side?

  11. #11
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    Quote Originally Posted by crankyandy View Post
    do you have a surly tugnut chain tensioner in drive side?
    and/or running quick release or bolts?

  12. #12
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    I got the tugnut installed. However, I used a QR...

  13. #13
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    I use a DT Swiss RWS (ratcheting) skewer. Holds the wheel in place really well if you are using the quick release option.

  14. #14
    fresh fish in stock...... SuperModerator
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    i threw chains on my 1X1 (with tug and thru bolt, WI trial FW, and eno up front)...

    happened on sharp short bursts up steep sections...

    always made my friends laugh...and it always hurt.

    blah.
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