How make a Chain tensioner ?

Discussion in 'Motorized Bicycle General Discussion' started by cj200, May 27, 2012.

  1. cj200

    cj200 New Member

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    hi how will i make a How make a Chain tensioner like this one in the photo

    can i used a old derailer to make? or where is there a place one that i can?

    [​IMG]
     
  2. 2door

    2door Moderator
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    Most derailer sprockets are made of plastic. They won't hold up to the stress of an engine drive chain. The photo you show is a steel industrial sprocket available at industrial suppliers. It will take some fabrication skills to adapt one to your needs.

    A better alternative is a skateboard wheel. It will need to be grooved to fit the chain but most of the better ones have good bearings and are made of polyurethane that will wear well and run quiet.
    Here's some reading on the subject for you > http://www.google.com/cse?cx=partne...80#gsc.tab=0&gsc.q=chain tensioner&gsc.page=1

    http://motorbicycling.com/showthread.php?t=11815

    Good luck.

    Tom
     
    #2 2door, May 28, 2012
    Last edited: May 28, 2012
  3. cj200

    cj200 New Member

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    will i mount the skateboard wheel on the bracket i have on my bike now it is this one here?

    [​IMG]
     
  4. donphantasmo

    donphantasmo Member

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    Yes CJ. Machine a groove in it so the chain doesn't move. Also, if you can find an old sprocket laying around, that works great, too
     
  5. cj200

    cj200 New Member

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    ok thanks, what kind of sprocket? derailed or bike chain sprocket?
     
  6. professor

    professor New Member

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    Derailer chain is slightly narrower than coaster type.
    Idler sprockets are available from McMaster Carr.
    I have welded sprockets to modified V belt idlers.
    One suggestion: the strongest mount would bridge two sections of the rear frame instead of just sitting on one rail.
     

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