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Rohloff half-step

Old 08-23-19, 04:40 AM
  #1  
gauvins
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Rohloff half-step

It is a bit like malaria. Every once in a while, because of a post, a picture, a comment somewhere, I am struck by rohloff fever. Ruled out when I have my mind to myself because of its obscene price, I nonetheless daydream, because, true, this is an amazing feat of engineering. And in my worst days I can rationalize investing 1500$ to save 60$/year.

I've downloaded and read the owner's manual. And now have one question: has anyone tried their suggested half-step setup (say, 39-42 chainrings)? The rohloff has 14 uniform 13.5% gear-inch increments. A half step setup would provide 28x6.75% steps. Which would weaken my major argument against getting one (my modest setup provides 5% increments across most of the mid-high range, something I really appreciate; 13% is a lot when shifting from 13 to 14).

If you run a rohloff half step, does it imply a chain tensioner (I'd assume yes).

Last edited by gauvins; 08-23-19 at 04:48 AM.
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Old 08-23-19, 08:24 AM
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alan s 
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I’ve not found the need for smaller steps between gears. In fact, sometimes I’ll shift 2 or more gears at a time. You’ll be taking away from the simplicity and longer chain life of a straight chain line, which is one of the main benefits of a Rohloff.
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Old 08-23-19, 09:09 AM
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Originally Posted by alan s View Post
I’ve not found the need for smaller steps between gears. In fact, sometimes I’ll shift 2 or more gears at a time. You’ll be taking away from the simplicity and longer chain life of a straight chain line, which is one of the main benefits of a Rohloff.
I am not a Rohloff fan, but moving between two chain rings isn't really very much of a compromise in chain line. Assuming you set the chain line straight between the two rings you are talking about the chain line being off by a pretty minuscule amount. What? About 1/8" of so for either ring. It will still be essentially straight for all practical purposes. I'd bet most don't bother to get their chain lines any closer than that any way and that small difference will show no noticeable difference.

If you are really particular the difference in chain line may worry you, but I doubt it will make any noticeable difference at all in actual practice.

It will have the disadvantage of a tensioner. I probably wouldn't find it worth the trouble to get steps that small, but if you want/need them it may be worthwhile.

As I said I am not a Rohloff fan and can find a number of other reasons to avoid the setup, but chain line wouldn't be one of them.
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Last edited by staehpj1; 08-23-19 at 09:15 AM.
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Old 08-23-19, 06:27 PM
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Have you considered the poor mans Rohloff.. the Shimano Alfine 8 or a Sturmey Archer?

They say it's equal in range to an 11 -34 cassette and more reliable than an Alfine 11. I've been thinking about it for my off road tour bike as the one thing it can't handle reliably now is singletrack in long grass. It gets caught in the derailer quite a bit. An IGH would solve that but I won't buy a Rohloff unless I come into a lot of disposable income.

Combine the Alfine 8 with a compact double and it may provide a fairly usable gear range for road touring.

Last edited by Happy Feet; 08-23-19 at 06:32 PM.
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