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  1. #1
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    looking for 20" 9 gear cassette hub wheel

    hi there all - i have a downtube 20" folding bike which was modified by the previous owner.
    The rim on the rear wheel is on it's last legs and my local bike mechanic suggest that with the cassette hub not of good quality i will be better of with new wheel but he cant get a 20" 9 gear one. i was looking online and all i could find is a BMX one on ebay for over 100 pounds which doesnt look like mine anyway.
    so does anyone have any idea where can i get one at reasonable price?
    he did mention it was a light hub - dont know if that makes a difference?
    cheers
    michel

  2. #2
    Senior Member mechBgon's Avatar
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    If it were me, I'd just ask the mechanic if he could build me a wheel with my choice of hub and rim.

  3. #3
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    I'd ask this question over at the folding bike forums:

    http://www.bikeforums.net/forumdispl...-Folding-Bikes

    Somebody there ought to know.

  4. #4
    Senior Member Monster Pete's Avatar
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    I'd obtain any 20" wheel with a good rim and the same spoke count. It should be a relatively simple wheelbuilding exercise to mate the good rim to your existing hub.
    I've got a bike, you can ride if you like it's got a basket, a bell that rings and things to make it look good- Pink Floyd, 1967

  5. #5
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    Bike Friday (www.bikefriday.com) provides 20" (both ISO 406 and 451) wheels on their folding bikes and generally uses good quality hubs and rims. They may sell the wheels as a replacement item. I'd try them first.

  6. #6
    coprolite fietsbob's Avatar
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    +1 on Bike Friday .. they will have experience building 20" wheels
    with all sorts of drivetrain options.

    I have a Pocket Llama, Rohloff hub ..

    In UK ? I'd just get one built there, someone has a spoke rolling machine
    to cut down and re thread existing stainless spokes..
    Last edited by fietsbob; 09-24-11 at 05:41 PM.

  7. #7
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    Quote Originally Posted by mechBgon View Post
    If it were me, I'd just ask the mechanic if he could build me a wheel with my choice of hub and rim.
    he told me he could rebuild the rim but suggested that as my hub is a cheap quality one i might be better changing the lot. in regard to rebuilding the wheel around the hub he suggested it will be quite expensive as he wll need to order special spokes and the labour

  8. #8
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    yeah in UK so need someone here or someone who can send the wheel here.

    sorry but have no idea on building wheels so it sounds very alien experience...

  9. #9
    coprolite fietsbob's Avatar
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    If you want to order a Bike Friday Built wheel The US Company
    has a distributor in the UK,
    to work thru, or perhaps just build it there...

    you might get a Shimano Alfine 11 speed IG hub, built up, in a wheel,
    wide range of ratios ,
    a nice bit of kit.

    sorry but have no idea on building wheels so it sounds very alien experience...
    it's not alien to a professional bike mechanic,
    but they do need to get paid for their efforts..
    Labour, shop overhead , parts costs.
    Last edited by fietsbob; 09-24-11 at 09:08 PM.

  10. #10
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by mmoalem View Post
    he told me he could rebuild the rim but suggested that as my hub is a cheap quality one i might be better changing the lot. in regard to rebuilding the wheel around the hub he suggested it will be quite expensive as he wll need to order special spokes and the labour
    It shouldn't cost more than building any other wheel. There's no special skill building a 20" wheel vs. a more conventional wheel, and the spokes should cost the same.

    Seek out a shop that regularly services other folding bikes, such as Brompton or Dahon. I'm willing to bet they will have a replacement rear wheel available, ready to go.
    Jeff Wills

    All my bikes.

  11. #11
    Senior member Dan Burkhart's Avatar
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    Quote Originally Posted by mmoalem View Post
    hi there all - i have a downtube 20" folding bike which was modified by the previous owner.
    The rim on the rear wheel is on it's last legs and my local bike mechanic suggest that with the cassette hub not of good quality i will be better of with new wheel but he cant get a 20" 9 gear one. i was looking online and all i could find is a BMX one on ebay for over 100 pounds which doesnt look like mine anyway.
    so does anyone have any idea where can i get one at reasonable price?
    he did mention it was a light hub - dont know if that makes a difference?
    cheers
    michel
    Any decent shop should be able to build you one. Just be sure to get the right size rim. 20" could be 406 or 451 BSD.
    Easy enough to tell, if the tire is 20 x fraction, it's 451. If the second number is a decimal, it's 406.
    Only other critical dimension is the over locknut dimension of the hub.
    Alternatively, if you have a good recumbent shop in your area, they may have someting ready made that will work.
    Gearhubs demystified and other cool stuff.


    The greatest mistake you can make in life is to be continually fearing you will make one. Elbert Hubbard.

  12. #12
    Senior Member mrrabbit's Avatar
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    8/9 and 7 speed 130mm and 135mm rear wheels for folding bikes are are custom made right here in San Jose...

    Google is your friend...

    =8-)
    4000+ wheels built since 1984...

    Disclaimer:

    1. I do not claim to be an expert in bicycle mechanics despite my experience.
    2. I like anyone will comment in other areas.
    3. I do not own the preexisting concepts of DISH and ERD.
    4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
    5. My all time favorite book is:

    Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life

  13. #13
    bike whisperer Kimmo's Avatar
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    Quote Originally Posted by mmoalem View Post
    he told me he could rebuild the rim but suggested that as my hub is a cheap quality one i might be better changing the lot.
    Unless there's actually anything wrong with your hub, I wouldn't bother.

    If it's a Shimano freehub in decent nick, your mechanic is full of crap as these last nearly forever when properly adjusted.

    Also, a small wheel will have exaggerated dish in terms of relative spoke angles, so if you can find an off-centre rim in 20" (doubtful) this would almost certainly be the rim to get.

  14. #14
    Senior Member badmother's Avatar
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    Last edited by badmother; 09-26-11 at 01:05 PM.
    °Empty drums make a lot of noice... (Old Hungarian proverb).

  15. #15
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    I'd just get a spoke wrench and a hub and a rim and build my own. Use spokecalc to get spoke lengths (there will be two lengths for the wheel), and use Sheldon Brown's wheelbuilding instructions.

    The dish isn't as big a factor with small wheels- the distances offset are the same as with big wheels, but the angles increase. This means the tension difference isn't as great.

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