shimano nexus internal hub - minimum ratio?
01-10-08, 11:35 AM
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shimano nexus internal hub - minimum ratio?
What's the minimum front chainring/rear sprocket ratio for the Nexus hub?
I can't find this information anywhere. Even the Rohloff specifies a minimum, so this hub must too.
I can't find this information anywhere. Even the Rohloff specifies a minimum, so this hub must too.
01-10-08, 02:09 PM
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bump.
I would really, really like to hear someone chime in on this who has an answer, or at least some experience with a range of ratios.
jim
I would really, really like to hear someone chime in on this who has an answer, or at least some experience with a range of ratios.
jim
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Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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01-10-08, 03:35 PM
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Have you tried calling Shimano directly? They don't have an e-mail address on their web site but they do answer the phone. Here is Shimano's US contact info:
Shimano American Corporation
One Holland, Irvine, California 92618 U.S.A.
Phone: +1-949-951-5003 / Fax: +1-949-768-0920
Shimano American Corporation
One Holland, Irvine, California 92618 U.S.A.
Phone: +1-949-951-5003 / Fax: +1-949-768-0920
01-10-08, 04:59 PM
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I don't believe they publish a minimum ratio. I know Rohloff does because they don't want you to break it by putting too much torque through it. I have mine at 48-19 but I know a couple of guys who are riding them with 42x23 with no problem. You better have a lot of hills to go up to ride that setup.
01-10-08, 05:42 PM
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There are too many variables for a meaningful number to be provided. Rohloff's is probably excessively conservative, 'cause Rohloff hubs are super-strong.
I can tell you that when we set up a Surly Pugsley with something like 24/22, the Nexus self-destructed (one of the gear rings cracked.)
I would guess that a 2:1 ratio would be pretty safe, maybe even a bit lower if you are gentle in changing gears and don't "slam" the pedals when resuming pedaling after coasting.
Sheldon "Not An Exact Science" Brown
01-11-08, 12:32 PM
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Actually, I believe Rohloff is the ONLY company that attempts to give a number for this.
There are too many variables for a meaningful number to be provided. Rohloff's is probably excessively conservative, 'cause Rohloff hubs are super-strong.
I can tell you that when we set up a Surly Pugsley with something like 24/22, the Nexus self-destructed (one of the gear rings cracked.)
I would guess that a 2:1 ratio would be pretty safe, maybe even a bit lower if you are gentle in changing gears and don't "slam" the pedals when resuming pedaling after coasting.
Sheldon "Not An Exact Science" Brown
There are too many variables for a meaningful number to be provided. Rohloff's is probably excessively conservative, 'cause Rohloff hubs are super-strong.
I can tell you that when we set up a Surly Pugsley with something like 24/22, the Nexus self-destructed (one of the gear rings cracked.)
I would guess that a 2:1 ratio would be pretty safe, maybe even a bit lower if you are gentle in changing gears and don't "slam" the pedals when resuming pedaling after coasting.
Sheldon "Not An Exact Science" Brown
Thanks for the info on the self destructing 24/22. I guess the upside of the Nexus is that (since Shimano is silent) experimenting with low primary ratios won't void the warranty.
Problem is that although keeping the primary ratio around 2:1 would be useful for most riding, it's not low enough for running dual chainrings up front to extend the range.
Last edited by makeinu; 01-11-08 at 12:41 PM.
