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  1. #1
    Senior Member badmother's Avatar
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    Anybody using a Shimano nexus7 on 20" wheels?

    I am building up a detatchable with 20" wheels and a Shimano nexus7 hub. Used it for some time already with the original BB + cranks for the bike but for sure the chainwheel was not right for the setup.

    Now that I painted and put a modern BB I wanted to put the right size chainwheel and sprocket for it. Can not find this hub in Sheldons calculator. Anybody using it so I can put it right ? Thank you.

  2. #2
    mjw
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    My dahon vitesse has a nexus 7. Maybe the information is in the manual? http://files.dahon.com/support/manua...inter7_hub.pdf

  3. #3
    Senior Member badmother's Avatar
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    Nothing about spocket and chainring size, only that the hub should only:
    "The CJ-NX10 cassette joint should only be used with sprockets from 16T to 23T". Important info, but not enough. I could just try it out, but better if I could get some info to start with.

  4. #4
    Senior Member badmother's Avatar
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    Not a lot of response so I had to try it out. Did my first testride on the bike today. The hub had a 19 tooth sprocket in the rear, I left it on. Put a 40 tooth chainring in the front since it was easely awailable at the moment. 170 cranks,20 x 1.95 BMX tyres. Great ride, but gearing a bit off. Had problems mowing forwards on flat ground, feet spinning fast . Mainly dogpower that kept me moing forwards.

    Thinking of trying out a 16 tooth sprocket I`we got lying around. If that is not enough I`ll start reducing the front chainwheel. I like the hub. It is spinning in a nice way, not much drag.

    Pix soon.
    Last edited by badmother; 01-13-09 at 02:37 PM.

  5. #5
    jur
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    It is on Sheldonbrown's site. Just look for the link at the bottom of the gear calc page which will take you to a hub geared page.

    http://sheldonbrown.com/gears/internal.html
    My folding bike photo essays www.dekter.net/

  6. #6
    Senior Member badmother's Avatar
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    Thank you! I do not know why I could not find it this time, I`we used it before..

  7. #7
    tcs
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    Quote Originally Posted by badmother View Post
    The hub had a 19 tooth sprocket in the rear, I left it on...Thinking of trying out a 16 tooth sprocket ...
    That will raise the gearing.

    If that is not enough I`ll start reducing the front chainwheel.
    And that will lower it back again.

    Best,
    tcs
    "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

  8. #8
    Senior Member badmother's Avatar
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    Quote Originally Posted by tcs View Post
    That will raise the gearing.



    And that will lower it back again.

    Best,
    tcs
    For sure. I should leave this until the morning when my head is working. Just had a look in the Dahoon forum. looks like they are discussing 52 tooth front rings as a maximum (for frame reasons) and 13 and 14 tooth cogs.

    What is confusing me is that I`we got a 24" with a nexus 7 and a 33 front chainwheel (stock). Not sure about rear. This is why I am thinking of a smaller front. I`ll put the 16 tooth in the rear and go for a ride, then decide.

  9. #9
    jur
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    Quote Originally Posted by badmother View Post
    For sure. I should leave this until the morning when my head is working. Just had a look in the Dahoon forum. looks like they are discussing 52 tooth front rings as a maximum (for frame reasons) and 13 and 14 tooth cogs.

    What is confusing me is that I`we got a 24" with a nexus 7 and a 33 front chainwheel (stock). Not sure about rear. This is why I am thinking of a smaller front. I`ll put the 16 tooth in the rear and go for a ride, then decide.
    Def: hoon: a foolish or silly person, especially one who is a show-off with a car [Aussie slang]

    So, a Dahoon is a hoon on a Dahon?
    My folding bike photo essays www.dekter.net/

  10. #10
    Senior Member badmother's Avatar
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    Quote Originally Posted by jur View Post
    Def: hoon: a foolish or silly person, especially one who is a show-off with a car [Aussie slang]

    So, a Dahoon is a hoon on a Dahon?
    So I should quit riding my Daho(o)n. It is old and too flexy anyways. My only defense is it is past 03.00 at night and I should stop writing anything. Brain is on "auto" and not sharp.

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