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Old 09-24-11, 03:17 PM   #1
mmoalem
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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
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Old 09-24-11, 03:27 PM   #2
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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.
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Old 09-24-11, 03:36 PM   #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.
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Old 09-24-11, 04:11 PM   #4
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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.
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Old 09-24-11, 04:26 PM   #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.
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Old 09-24-11, 04:37 PM   #6
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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 04:41 PM.
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Old 09-24-11, 05:36 PM   #7
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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
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Old 09-24-11, 05:41 PM   #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...
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Old 09-24-11, 08:05 PM   #9
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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.

Quote:
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 08:08 PM.
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Old 09-24-11, 08:38 PM   #10
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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.
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Old 09-24-11, 08:45 PM   #11
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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.
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Old 09-24-11, 08:59 PM   #12
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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-)
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Old 09-26-11, 08:46 AM   #13
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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.
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Old 09-26-11, 12:00 PM   #14
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http://hostelshoppe.com/cgi-bin/read...ory=1181663187

https://www.bikefriday.com/thestore/...11dO1&cPath=56

Last edited by badmother; 09-26-11 at 12:05 PM.
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Old 09-26-11, 02:06 PM   #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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