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Thread: Chain suck fin

  1. #1
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    Default Chain suck fin

    Has anyone ever considered brazing a "fin" to under side of the RH chainstay to avoid the deaded chain suck
    Was considering a design for my current build and thought I would check to see if i was re-inventing the wheel
    The fin would have some small tapped holes which i would screw a plastic strip, the sucking chain would strike the plastic prior to jambing between the chain stay and chain ring

    Cheers

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    Default Re: Chain suck fin

    Well, not quite reinventing the wheel...
     

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    Default Re: Chain suck fin

    Quote Originally Posted by Noteddy View Post
    Well, not quite reinventing the wheel...
    Under the stay, not on top, to reduce the chance of the chain jamming between the chain ring and stay. Not jamming between the stay and tire as the Shimano shark fin was meant to do.

    In any case, a fin will not prevent chain suck. Chain suck happens, even on elevated stay frames, because of worn parts, poor lubrication, dirty drivetrains, and/or poor chainline.

    Having the chain jam is a result of chain suck. Better to prevent the chain suck in the first place than trying to "fix" the result with add-on patches. The worst chain jams I have had were on bikes with anti-suck devices.
     

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    Default Re: Chain suck fin

    I think this is your huckleberry.
    ShimanoSharkTooth_MED.jpg
    Just put U-brake bosses on it and run a Shark Tooth;)
    ArrivalUBrake1.JPG
    They were so awesome Shimano made them for like a whole 5 minutes.
    Eric Doswell, aka Edoz
    Summoner of Crickets
    http://edozbicycles.wordpress.com/
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    In Before the Lock

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    Default Re: Chain suck fin

    Quote Originally Posted by edoz View Post
    I think this is your huckleberry.
    ShimanoSharkTooth_MED.jpg
    Just put U-brake bosses on it and run a Shark Tooth;)
    ArrivalUBrake1.JPG
    They were so awesome Shimano made them for like a whole 5 minutes.
    Yup, note the scrapes on the brake and stay where the chain jammed anyway.
     

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    Default Re: Chain suck fin

    I used to do this on our mountain bikes. I'd braze a plate with a couple of threaded holes that could take an aluminium plate that mirrored the profile of the chainrings. I think I saw Keith Bontrager do it first.

    Edit - like this :

    237557d1172204495-looking-bontrager-anti-chain-suck-plate-fb-chain-suck-50.jpg
    Steven Shand
    www.shandcycles.com
    Bicycle Manufacture - Scotland, UK

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    Default Re: Chain suck fin

    Quote Originally Posted by shand View Post
    I used to do this on our mountain bikes. I'd braze a plate with a couple of threaded holes that could take an aluminium plate that mirrored the profile of the chainrings. I think I saw Keith Bontrager do it first.

    Edit - like this :

    237557d1172204495-looking-bontrager-anti-chain-suck-plate-fb-chain-suck-50.jpg
    Steven beat me to it.
    Just don't let the little plates get loose or you will have an exceptional one-time chainsuck.
    - Garro.
    Steve Garro, Coconino Cycles.
    Frames & Bicycles built to measure and Custom wheels
    Hecho en Flagstaff, Arizona desde 2003
    www.coconinocycles.com
    www.coconinocycles.blogspot.com

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    Default Re: Chain suck fin

    The Ringle Anti Chain Suck Thing was the same idea. Worked well enough.
    Pete Ruckelshaus * Teacher, Fat Guy on a Bike * Collegeville, PA

    pruckelshaus' flickr
    Framejig.wordpress.com effort to collect DIY framebuilding jig designs

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    Default Re: Chain suck fin

    Klein put them on theirs, just took mine off. One piece, stepped.
    "Old and standing in the way of progress"

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    Default Re: Chain suck fin

    apparently all the MTB people that are worried about this have gone to something that mounts on an isgc mounting plate.
     

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    Default Re: Chain suck fin

    @Shiggy: what do you mean by elevated CS? I get frames in regularly with normal CSs. Once it's fixed they often want a protector like this:

    Cheers
    Kevin

    PolyTube Cycles

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    Default Re: Chain suck fin

    Quote Originally Posted by pruckelshaus View Post
    The Ringle Anti Chain Suck Thing was the same idea. Worked well enough...
    ...at jamming the chain even harder. Been there...
     

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    Default Re: Chain suck fin

    Quote Originally Posted by datas_brother View Post
    @shiggy: what do you mean by elevated CS? I get frames in regularly with normal CSs. Once it's fixed they often want a protector like this:

    You do not know what an elevated chain stay frame is? It is impossible for the chain to jam between the ring and stay because the chainstay is above the rings.

    My main point is the jamming in the frame is NOT chain suck. It is a RESULT of chainsuck, which can and should be addressed and fixed before resorting to the anti-jam devices.

    I have had chainsuck on a E-stay bike to the point of the chain wrapping around and jamming against the chain coming onto the top of the ring. The chain never touched the frame.
     

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    Default Re: Chain suck fin

    Shimano Shadow+ and Sram Type 2 derailleur's killed chainsuck dead.
     

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    Default Re: Chain suck fin

    Quote Originally Posted by shirk View Post
    Shimano Shadow+ and Sram Type 2 derailleur's killed chainsuck dead.
    No, increased RD tension does not cure the basic issues that cause chainsuck. If your rings are worn and/or have burrs, using poor lube, and/or have a dirty drivetrain, it can still happen with any bike using a rear derailleur.
     

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    Default Re: Chain suck fin

    Quote Originally Posted by datas_brother View Post
    @Shiggy: what do you mean by elevated CS?
    this is an e-stay bike;
    Attached Images Attached Images
     

  17. #17
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    Default Re: Chain suck fin

    Quote Originally Posted by shiggy View Post
    No, increased RD tension does not cure the basic issues that cause chainsuck. If your rings are worn and/or have burrs, using poor lube, and/or have a dirty drivetrain, it can still happen with any bike using a rear derailleur.
    If you can still get the chain to suck into the chainstays while riding with a Shadow+ you* have some serious problems. Time to take up knitting.

    *not you personally, referring to the generic rider with chronic chainsuck problems.
     

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    Default Re: Chain suck fin

    yeah, I was playing with one of those SRAM deralleurs and it had enough tension that it was a little scary
     

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    Default Re: Chain suck fin

    Quote Originally Posted by shirk View Post
    If you can still get the chain to suck into the chainstays while riding with a Shadow+ you* have some serious problems. Time to take up knitting.

    *not you personally, referring to the generic rider with chronic chainsuck problems.
    To repete, the jamming of the chain in the frame is NOT chainsuck, but just a result of it.
    Using a clutched RD cage is still just treating the symptoms rather than fixing the cause.
     

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    Default Re: Chain suck fin

    Quote Originally Posted by shiggy View Post
    To repete, the jamming of the chain in the frame is NOT chainsuck, but just a result of it.
    Using a clutched RD cage is still just treating the symptoms rather than fixing the cause.
    on a modern hardtail, with modern components, the cause is a horribly worn chain and front chainrings and usually some bad weather conditions. seems like an easy cause to treat.

    i used to get bad chainsuck on my ibis mojo fs. i cured it with a shorter chain and a single chainring up front.
     

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