Anti chain suck & chain stabilisation system

Discussion in 'Transmission / Drivetrain' started by Fabian, Feb 19, 2014.

  1. Fabian

    Fabian Well-Known Member

    These photos better show the inner face of the chain stabilisation that completely "stops" chain suck.

    If you look carefully you'll see that i had to totally encapsulate the chain as it travels over the first idler wheel (to prevent it jumping the flange) and required a device that sits (on the inner face) in between the forward and rearward idler wheels to prevent the chain from squeezing through the gap.

    The right hand side of the bike needed a larger disk glued onto the rearward idler wheel to stop the chain from squeezing itself in between the gap of the right hand side idler wheels.
    It was just unbelievable how the chain managed to find a way of escaping the idler wheels (given an opportunity), especially the front idler wheel which required a complete loop to surround the flanges to stop the chain trying to jump over the left and right side of the forward idler wheel flanges.

    This system has completely stopped all of the chain suck issues i was having; when the bike bashed and bounced over heavily potholed and washed out roads and logging tracks.



    Last edited: Feb 19, 2014
    FurryOnTheInside likes this.

  2. FurryOnTheInside

    FurryOnTheInside Well-Known Member

    Thanks for a very useful and informative thread, Fabian. I'm sure with these even more clear pics and description I will be able to fashion something that will do the job and even be a little more slick too, since I'll not have to go through so much experimentation I'll be able to build all the features you mentioned right from the start.

    Is the box-shaped whatsit something you made from scratch? Please can I have the inner dimensions? :D
  3. Fabian

    Fabian Well-Known Member

    Yes, it is made from scratch. I will have to measure up the dimensions.
    I am sure that you can simplify the design, or make the components better integrated and more compact. I just used the available parts from kits that were sitting unused in a box, then i cobbled together my design; refining it till the chain drive system was completely reliable, under harsh riding conditions.
  4. FurryOnTheInside

    FurryOnTheInside Well-Known Member

    Thanks Fabian. :)
    Indeed I will! You've definitely saved me a great deal of expense and a huge amount of time and effort by posting great info on your design and the problem solving process that led to it's current configuration. I'll still have to do some experientation of course, for a different frame and different sprockets, and using different parts to make the chain stabilisation system; but basically you've done me a huge favour and effectively made me an awesome test rig bike and test ridden it for me and modified it til it's about the best prototype I could imagine. :bowdown:

    I plan to use mostly old rear derailleur parts due to availablity and price.. Plus toothed jockey wheels should have an advantage in handling the chain more smoothly (chain surface undulates, so rolling or dragging it over a circular wheel causes resistance and induces vibration). I'm hoping I'll get enough parts this summer to at least run the engine and drive system in a stand, then complete the build next January when the sales are on in the bike shops, and I'll share info as soon as I can. :)