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Nexus + double crankset?

Old 06-04-19, 07:09 AM
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Winfried
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Nexus + double crankset?

Hello,

Some people I know have a couple of Dahon folders that have a Nexus 7 gear hub.

With a 245% range, those bikes are fine for small rides in relatively flat areas, but don't have enough gear range for travelling.

I have a couple of questions:
  1. I read that some people installed a double crankset for use with Nexus/Alfine gear hubs, although the ratio blows away Shimano's torque limitation: How reliable is that solution in practice?
  2. How easy is it to replace a Nexus 7 for a Nexus/Alfine 8?
For instance, a Nexus 8 + 16T cog + 50/34T crankset would provide a gear range of 1.6-7.4m.

Thank you.

Last edited by Winfried; 06-04-19 at 07:13 AM.
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Old 06-05-19, 12:34 PM
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fietsbob 
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2 pulley chain tensioner and you can give it a try.. they're like a short cage RD

make the low gear within the range acceptable for the hub , big ring higher than that will be fine..

I've only used the big reduction gear 2 speed crank on my 3 speed.
It does not use an internal gear change, just changes the application..
the gears themselves never shift, only the pawls ..
(My Brompton, with a mountain drive crank.. ) 54: 15

Rohloff * gives you a minimum but higher gears are said to me fine ..
so the hub in my 20" wheel with a 53t chainring is better by their suggestions,
than the same hub in a 26" wheel with a 38t chainring.

* I have the manual for that, not for the Nexus, but you can find the one for your hub, online ...


How easy is it to replace a Nexus 7 for a Nexus/Alfine 8?
Order a pre built wheel from your favorite bike shop, through their wholesaler is simplest..
maybe go for their 11 speed and that will be wide enough a range?

....

Last edited by fietsbob; 06-05-19 at 12:41 PM.
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