What size sprockets?

Discussion in 'Frame Mounted Engines' started by DamoMotorized, Sep 24, 2009.

  1. DamoMotorized

    DamoMotorized New Member

    I am making a motorized bike similar to this one: http://www.youtube.com/watch?v=uruaRsCHvk4, but I am not sure what size sprockets I should use where the 2 red circles are on the picture below. I dont want to buy new sprockets, the sprockets I have now are 14, 17, 20, 24 and 28 teeth. Should I just use the smallest sprocket (14 teeth) on the engine and the biggest sprocket (28 teeth) on the bottom part?

    For the other side of the bike i going to keep the 2 sets of sprockets so i will be able to change gears.

    Also, i am using a 31cc Ryobi weed wacker engine with clutch.


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    Last edited: Sep 24, 2009

  2. DamoMotorized

    DamoMotorized New Member

    I dont know if this is going to change much, but I only weigh around 50kg.
    Last edited: Sep 24, 2009
  3. DamoMotorized

    DamoMotorized New Member

  4. DamoMotorized

    DamoMotorized New Member

    I have done some research and thinking and I am pretty sure that im just going to make a friction drive bike. The chain drive method is much more complicated then i thought it would be.
  5. professor

    professor Active Member

    You need a jackshaft to gear down enough to use that set-up.