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Old 01-10-09, 05:32 PM   #1
badmother
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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.
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Old 01-10-09, 05:51 PM   #2
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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
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Old 01-10-09, 06:26 PM   #3
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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.
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Old 01-13-09, 02:33 PM   #4
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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.

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Old 01-13-09, 04:28 PM   #5
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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
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Old 01-13-09, 06:26 PM   #6
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Thank you! I do not know why I could not find it this time, I`we used it before..
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Old 01-13-09, 06:49 PM   #7
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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.

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

Best,
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Old 01-13-09, 07:58 PM   #8
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That will raise the gearing.



And that will lower it back again.

Best,
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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.
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Old 01-13-09, 08:14 PM   #9
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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?
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Old 01-13-09, 08:20 PM   #10
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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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