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  1. #1
    Senior Member
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    Sep 2007
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    Change from 74BCD to 58BCD

    I wanted some lower gears for my old legs,but really wanted to keep my old crank.So I looked into the quad ring adapter thing that takes Suntour? Regina? freewheel gears.Good idea,too hard to get gears for.So I figured,whoever made that thing is human,so am I,so I can make one too!

    Got a piece of 1/8"-6061 tempered aluminum from work and brought it home.I wanted to see if I could make this with hand tools,things us types might have around the garage.I used a power drill,drills,coping saw,hacksaw and some hand files.

    I used the above tools to make one of these out of aluminum:

    http://







    Bolted it to the crank,set up the spacing,Done. Works Great! Shifts Great! How bout that...a 20 tooth gear on a crank with a 74BCD!

    http://

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    Last edited by Booger1; 09-21-08 at 10:05 PM.
    Everything should be as simple as possible...But not more so.---Albert Einstein

  2. #2
    Mike
    Join Date
    May 2006
    Location
    Cayman Islands
    My Bikes
    Cignal Silverado MTB
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    Brilliant idea. Doing the drawing using a CAD program, you can do any adapter you want with great accuracy, even add a 4th chainwheel. Gotta try this out!

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