Problems with Chain Drop- Mtbr.com
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  1. #1
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    New question here. Problems with Chain Drop

    I put a BMX 180mm crankset with a 48T chainring on my commuter bike and have dropped the chain many times. It drops to the outside of the chainring.


    I run a seven cog MTB cassette.

    I was wondering if anyone makes a bashguard or a chain catcher to help with this.


    Any suggestions are welcome. Thanks!
    2012 Cannondale Trail SL 29ER 4

    1994 Cannondale Super V 1000

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  2. #2
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    I am sure there are cheaper versions out there, but I always wanted something like this

    Rohloff Upper Chain Guide - AEBike.com - Thousands of bicycle parts and accessories - Shipped Worldwide
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  3. #3
    Ex-Clydesdale
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    I was having the same problem, and since I tried to minimize costs on my commuter build, I didn't want to plunk down $50-100 for a chain guide. So I made my own. Is it as fancy or as bling? Heck no. Have I dropped the chain since making/installing it? Nope. I put it together quick, it works, but if I can make it look a little nicer I will. $10 for the braze-on front derailleur adapter, and $5-6 in hardware at Lowes.





    I can't claim credit for the idea though, I saw it here originally:
    1x9 Chain Guide Device Singletrack Forum
    '94 RSBikes Stampede (commuter), '05 Prophet, '09 Scattante XRL Team, '10 Slice 4
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  4. #4
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    Quote Originally Posted by L4NE4 View Post
    I am sure there are cheaper versions out there, but I always wanted something like this

    Rohloff Upper Chain Guide - AEBike.com - Thousands of bicycle parts and accessories - Shipped Worldwide
    wow that thing costs more than a front derailleur

  5. #5
    weirdo
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    That looks pretty slick, Dwayne.

  6. #6
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    Quote Originally Posted by Dwayne View Post
    I was having the same problem, and since I tried to minimize costs on my commuter build, I didn't want to plunk down $50-100 for a chain guide. So I made my own. Is it as fancy or as bling? Heck no. Have I dropped the chain since making/installing it? Nope. I put it together quick, it works, but if I can make it look a little nicer I will. $10 for the braze-on front derailleur adapter, and $5-6 in hardware at Lowes.





    I can't claim credit for the idea though, I saw it here originally:
    1x9 Chain Guide Device Singletrack Forum
    Very nice set up!


    Did you have to cut anything to fit or did you get everything as is?

    Also, do you happen to have a materials list on said set up?


    Thanks again for sharing !
    2012 Cannondale Trail SL 29ER 4

    1994 Cannondale Super V 1000

    1996 Cannondale F500 rigid-fork 69'er

    Motiv 26'er

  7. #7
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    Paul Components makes one too:

    Paul Components Paul Chain Keeper 35.0 - Black in Tree Fort Bikes Chain Guides (cat463)

    Or you could put a bash guard on there where your outer ring would go.

  8. #8
    Wierdo
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    Quote Originally Posted by cda 455 View Post
    I put a BMX 180mm crankset with a 48T chainring on my commuter bike and have dropped the chain many times. It drops to the outside of the chainring.
    Under what circumstance does it drop? Randomly when pedaling? When shifting (and into what gears)? Over bumps? More information would help.

  9. #9
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    How is the chain length? Chainline? You could use and old road front der. too. Just position it so it does not rub the chain.

  10. #10
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    My chain drops all the time. I've about chucked my bike of a railroad bridge. So irritating and not even 500 miles on my commuter. Single ring up front, normally drops only when shifting up into highest four gears.
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  11. #11
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    Quote Originally Posted by leeboh View Post
    How is the chain length? Chainline? You could use and old road front der. too. Just position it so it does not rub the chain.
    Winnar !!


    I did exactly that. Thanks for the tip!
    .
    Attached Thumbnails Attached Thumbnails Problems with Chain Drop-cranset48chainring-001.jpg  

    Problems with Chain Drop-cranset48chainring-003.jpg  

    2012 Cannondale Trail SL 29ER 4

    1994 Cannondale Super V 1000

    1996 Cannondale F500 rigid-fork 69'er

    Motiv 26'er

  12. #12
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    Quote Originally Posted by leeboh View Post
    How is the chain length? Chainline? You could use and old road front der. too. Just position it so it does not rub the chain.
    This. Find a local co-op or throw a couple bones at your LBS to get a throwaway cheap FD and put it on there as a cheap changuide.

    How is the chainline with the BMX cranks? This could be an issue since BMX cranks are designed around a much smaller chainline than road bikes and specially mountain bikes.

  13. #13
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    Old parts usually have an afterlife.

  14. #14
    Bedwards Of The West
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    I had that issue on my commuter, but I just got better at shifting... let up, then shift up (it only happened when shifting up, I never threw it downshifting), and take it easy for that first 1/8 of a crank rotation before you put the hammer back down. With a little practice you shift this way without thinking about it, and it doesn't cost you any momentum or money.

    What happens is that the chain gets a whip action going that starts at the rear cog and works its way forward towards the chainring when it pops down onto that smaller sprocket in the back. If you let this 'wave' in the chain run it's course before you mash the pedals, the chain won't pop off. Any form of chain keeper just stops the wave from reaching the chainring.

    Of course if you don't want to have to think about it, any of these solutions are great
    You have no excuse for driving to work
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  15. #15
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    My solution:


  16. #16
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    Quote Originally Posted by krull View Post
    My solution:

    I use something similar for one by XXX setups... bashguard on the outside a little tab or something on the inside.... clean looking and effective.

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