Shimano Nexus 4-Speed Hub - Blocking the Freewheeln
09-17-14, 03:08 AM
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Shimano Nexus 4-Speed Hub - Blocking the Freewheeln
Hello Community.
I owe a Shimano Nexus 4-Speed hub with drum brake and freewheel.
But i need to block the freewheel that the pedals are fixed to the driving wheel.
Does some one know if this is possible or even better has someone a manual how to do this?
I owe a Shimano Nexus 4-Speed hub with drum brake and freewheel.
But i need to block the freewheel that the pedals are fixed to the driving wheel.
Does some one know if this is possible or even better has someone a manual how to do this?
09-17-14, 08:25 AM
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The "freewheel" you refer to is intrinsic in the design of the hub and cannot be removed.
09-17-14, 08:37 AM
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Freewheel IGH hubs can not be changed to fixed wheel mode. The internals of free and fixed IGH hubs a re completely different.
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09-18-14, 07:52 AM
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Converting a Sturmey-Archer AW Hub Into a Two-speed Fixed Gear
You're on your own trying this with the Nexus 4-speed hub, though...
09-18-14, 08:22 AM
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Shopping solution : You want the S-A S3X* in the rear wheel if you want a 3 speed fixie..
sell your rear wheel buy another.. shifter etc , whole kit.
*https://www.sturmey-archer.com/produc...d/3/id/47.html
sell your rear wheel buy another.. shifter etc , whole kit.
*https://www.sturmey-archer.com/produc...d/3/id/47.html
Last edited by fietsbob; 09-18-14 at 03:54 PM.
09-18-14, 09:50 AM
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I kinda like the shimano IGH-4's. If you also have a shifter I might be interested if the deal is good enough
09-18-14, 02:11 PM
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@rhm intuited that my S3X is probably a 5-speed hub with a few differences to make it fixed, and the consequence is that it's only a 3-speed.
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09-18-14, 03:45 PM
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@rhm intuited that my S3X is probably a 5-speed hub with a few differences to make it fixed, and the consequence is that it's only a 3-speed.
More generally, IGHs can generally only gear in one direction (i.e. above or below direct drive) if they're fixed-gear, which is why the new S3X fixed hub, the old SA ASC fixed hub and my ancient SA TF all gear down from direct drive only. That 4-speed has direct drive somewhere in the middle, I believe, and as such couldn't be converted to fixed-gear even theoretically without losing at least one gear. SA AW hubs can be converted to fixed-gear, but again, you lose the abilty to gear up, so they become two-speeds.
09-18-14, 04:00 PM
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S3X is .. 1:1 for high, .75 and .63 for second & low yes those are the lower 3 gear ratios same as 3/5 ths of the 5 speed.
the driver splines are also threaded so a freewheel can be screwed on later, if you change your mind & want a freewheel hub again.
the driver splines are also threaded so a freewheel can be screwed on later, if you change your mind & want a freewheel hub again.
09-18-14, 04:21 PM
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Go S3X if you want a fixed gear hub. Its quite enjoyable and you can adjust your fixed cadence depending on headwind resistance or to get more out of pushing yourself to your limit. 
09-18-14, 07:06 PM
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It is. I've seen a diagram of how it works. Some of the components are lifted straight from the new wide-range SA 5-speed (including the right-hand ball ring, which has a completely redundant ratchet face on the inside as a result of that fact)
More generally, IGHs can generally only gear in one direction (i.e. above or below direct drive) if they're fixed-gear, which is why the new S3X fixed hub, the old SA ASC fixed hub and my ancient SA TF all gear down from direct drive only. That 4-speed has direct drive somewhere in the middle, I believe, and as such couldn't be converted to fixed-gear even theoretically without losing at least one gear. SA AW hubs can be converted to fixed-gear, but again, you lose the abilty to gear up, so they become two-speeds.
More generally, IGHs can generally only gear in one direction (i.e. above or below direct drive) if they're fixed-gear, which is why the new S3X fixed hub, the old SA ASC fixed hub and my ancient SA TF all gear down from direct drive only. That 4-speed has direct drive somewhere in the middle, I believe, and as such couldn't be converted to fixed-gear even theoretically without losing at least one gear. SA AW hubs can be converted to fixed-gear, but again, you lose the abilty to gear up, so they become two-speeds.
Hopefully, this explains it better than drawings can.
https://www.youtube.com/watch?v=AJmUds2YQ74
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