Will my chain hit my tire?

Discussion in 'Rack Mounted Engines' started by keatonx, Feb 16, 2011.

  1. keatonx

    keatonx Member

    I'm building a rack mounted weed eater bike. However, my rear sprocket can only be mounted where the chain sits a half-inch from the nobbies of the tire. Will it hit the tire when I'm riding it? I might be going over some bumps.

  2. professor

    professor Active Member

    If you are thinking of running a chain direct from the engine to the wheel- you are going to need a huge sprocket to get the ratio you need.
    I just advised against doing a weed eater conversion. They usually have one main bearing and are not designed for side loading (like with a chain), have very little power too.
    by the way, a 1/2 inch is enough clearance for a chain.
  3. loquin

    loquin Active Member

    Agree with this. Unless the chain is completely worn out, it has very little side-to-side 'play' even if it has a lot of play in/out.
  4. keatonx

    keatonx Member

    Good point, loquin.

    P.S. professor, if you dissasemble a weed eater you will find there is 2 bearing, but on the same side. If it had one, it would twist with every power stroke. :) Anyways, I have a intermediate reduction on the engine so the pressure is on that. In total I have 14:1 and it's a big 31cc reed engine.
    Last edited: Feb 19, 2011