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  1. #1
    mtbr member
    Join Date
    Jun 2006

    The latest homemade 74mm to 58mm chainring adaptor.

    74 58 | Flickr - Photo Sharing! here is a chainring adapter made out of a computer hard drive. I used a 20 tooth Sugino chainring because I had one however this leaves open the possibility of using single speed cogs these have holes drilled in them to make them lighter. At first I tried a 1.2mm thick stainless pizza cutter however it bent while I was filing it. You need 10 bolts with a platter this thick other wise it will buckle also use washers on the nuts or the notches will dig into the aluminum.. The clearance between the nuts and the crank arms are 2mm this would make it difficult to use standard bolts and nuts.This is a prototype it is still undergoing testing I took it up a 12 percent grade with a total load of 300 pounds using a 40 tooth rear and I'm still alive.
    "Dish is illogical." Spoke of Vulcan.

  2. #2
    Reputation: DeeEight's Avatar
    Join Date
    Jan 2004
    Just couldn't bring yourself to buy an Avid MicroAdapter or M.A. 2 ?
    I don't post to generate business for myself or make like I'm better than sliced bread

  3. #3
    mtbr member
    Join Date
    Apr 2012
    Cool DIY (rep for you!) but needs more steps

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