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    Senior Member brianinc-ville's Avatar
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    Mobiky Genius gearing?

    I've never seen a Mobiky Genius in person, but I'm intrigued. I can't seem to find the gearing information anywhere on the Internet, though. If you've got one: how many teeth do each of the three sprockets have, what kind of 3-speed hub does it have, and then (maybe) can we figure out what that means in gear inches? Thanks!

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    tcs
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    AtoB magazine reported that the Mobiky Genius had three gears of 37", 50" and 66".
    "When man first set woman on two wheels with a pair of pedals, did he know, I wonder, that he had rent the veil of the harem in twain? A woman on a bicycle has all the world before her where to choose; she can go where she will, no man hindering." The Typewriter Girl, 1899.

    "Every so often a bird gets up and flies some place it's drawn to. I don't suppose it could tell you why, but it does it anyway." Ian Hibell, 1934-2008

  3. #3
    Senior Member brianinc-ville's Avatar
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    Quote Originally Posted by tcs View Post
    AtoB magazine reported that the Mobiky Genius had three gears of 37", 50" and 66".
    Excellent! Thanks!

  4. #4
    Senior Member cyqlist's Avatar
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    The sprocket sizes are 33, 28/14, and 16. The nominally 12 x 2 tires (ISO 62-203) are actually only 12" in diameter.

    33/14 x 28/16 x 12" = 49.5" for direct drive.

    The hub on mine is a Sturmey Archer SRB3 with 4/3 and 3/4 ratios for high and low, giving 66" for the high and 37" for low gear. Newer versions may have a Shimano Nexus hub which has slightly wider ratios for high and low.

    I changed my rear hub sprocket from 16 to 18 teeth, which gets me up hills a little easier, and provides a little more clearance between the chain and the chainstay.

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