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Old 11-21-11, 11:04 PM   #1
Wallstreetjazz
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Sturmey-Archer Cable Pull

Greetings everyone,

I'm working on a future (winter) project using a Sturmey-Archer 3 speed hub and I don't have one yet but purchase a wheel after the project gets rolling more. I need to know two things that aren't readily available.

1. The length of cable required to shift the hub from:
a. gear 3 to gear 2
b. and from gear 2 to gear 1

2. The force required to keep the hub in the lowest gear (in ounces?)

I believe that the lowest gear requires the longest cable pull, if I'm wrong just let me know. Imperial or metric measurements are welcome. Any current Sturmey-Archer 3 speed hub is welcome (S-RF3, S3X, ab, etc.). Information on S-A five speed hubs are welcome too.

Any assistance is greatly appreciated.
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Old 11-22-11, 06:28 AM   #2
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I can check out the cable pull question for you and get back to you later this morning with that, but I don't have the means to accurately measure for your force question.
I could rig a fisherman's scale to try it with, but I'm not sure how accurate it will be.
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Old 11-22-11, 07:13 AM   #3
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S-A AW series of hubs:
Gear 1 to 2: 7.4mm
Gear 2 to 3: 11.2mm

Another thought: Gear 2 must be aligned. Gear 1 happens when the cable is taut. Gear 3 happens when the cable is slack.

Of the current production, the RS-R*3 series, the S3X hubs and the CS-R*3 series Sturmey-Archer three speed hubs have different cable pulls than the AW series hubs.

HTH
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Old 11-22-11, 07:17 AM   #4
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Originally Posted by fietsbob View Post
S-A was founded in 1909.
1902.
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Old 11-22-11, 07:19 AM   #5
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Length depends on the bike’s frame, plus where you put the fulcrum sleeve.
Why not use a standard S/A shifter?
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Old 11-22-11, 07:30 AM   #6
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Quote:
Originally Posted by tcs View Post
S-A AW series of hubs:
Gear 1 to 2: 7.4mm
Gear 2 to 3: 11.2mm

Another thought: Gear 2 must be aligned. Gear 1 happens when the cable is taut. Gear 3 happens when the cable is slack.

Of the current production, the RS-R*3 series, the S3X hubs and the CS-R*3 series Sturmey-Archer three speed hubs have different cable pulls than the AW series hubs.

HTH
I hope that's not the case. I have a rotary 3 speed still in the box that came with a standard 3 speed shifter.
One thing to note however is the rotary hub is low normal as opposed to the high normal of traditional Sturmey hubs.
EDIT: I just discovered I was mistaken about the low normal bit. I surmised that from playing with the hub without the rotary mechanism attached.
Checking further, I discovered that the spring return is housed in the rotary mechanism, and it is high normal when set up.
EDIT AGAIN: I just placed a call to UBS to enquire about the rotary shifter. It turns out it is indeed a dedicated shifter, and not interchangeable with the classic SA 3 speed.
Learning lots of stuff today.
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Old 11-22-11, 08:53 AM   #7
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I just checked a 3 speed trigger shifter on my cable pull measuring tool, and I get 8.6mm for 1 to 2 and 15mm for 2 to 3.
I didn't even try my fisherman's scale on the hub because it has one lb increments very close together. I doubt I could get any useful info for you.
EDIT: See above, the shifter I measured was for the rotary hub, clearly different from the classic shifter as referenced by tcs above.
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Last edited by Dan Burkhart; 11-22-11 at 10:26 AM.
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Old 11-22-11, 12:47 PM   #8
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Originally Posted by Dan Burkhart View Post
EDIT: See above, the shifter I measured was for the rotary hub, clearly different from the classic shifter as referenced by tcs above.
Yeah, your C30 (rotary gear select) hub probably came with the DLC34 push-push shifter and should say "C30" above the gear indication window. The quite similar DLS30 push-push shifter for the S30 (traditional pull chain gear select) hubs says "S30" above the gear indication window.
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Old 11-22-11, 01:16 PM   #9
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Yeah, your C30 (rotary gear select) hub probably came with the DLC34 push-push shifter and should say "C30" above the gear indication window. The quite similar DLS30 push-push shifter for the S30 (traditional pull chain gear select) hubs says "S30" above the gear indication window.
You are correct, it does say C30. I confused myself by trying to compare shifters on Sturmey Archer's web site. I should know better than that by now, because they are notoriously slow about updating things like that.
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Old 11-22-11, 10:55 PM   #10
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As long as the current hubs are not vastly different I can do fine tuning later. So I guess we're looking at a little under an inch of travel, and less than 2 pounds required to shift.

The reason I need to know this is so I can buy the correct servo for the task (I hope you can see where I'm going with this). It's pretty easy to get a servo to pull ~1 inch of cable at 32 inch pounds (Where A is the angle of servo; L is the length of cable to some center point; length of cable pulled = sqrt([sin(A)^2]+[(L-cos(A))^2]). Now I think I'll be free to get the fastest servo for the job.
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Old 11-23-11, 05:44 AM   #11
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Originally Posted by Wallstreetjazz View Post
As long as the current hubs are not vastly different I can do fine tuning later. So I guess we're looking at a little under an inch of travel, and less than 2 pounds required to shift.

The reason I need to know this is so I can buy the correct servo for the task (I hope you can see where I'm going with this). It's pretty easy to get a servo to pull ~1 inch of cable at 32 inch pounds (Where A is the angle of servo; L is the length of cable to some center point; length of cable pulled = sqrt([sin(A)^2]+[(L-cos(A))^2]). Now I think I'll be free to get the fastest servo for the job.
Well, fill us in on the result. This is interesting.
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Old 06-18-15, 10:55 AM   #12
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Originally Posted by tcs View Post

Of the current production, the RS-R*3 series, the S3X hubs and the CS-R*3 series Sturmey-Archer three speed hubs have different cable pulls than the AW series hubs.

HTH
Yes, this is a necrobump. But I wanted to thank you for this information. SA's website implies as much but doesn't come out and say it. I spent a couple hours trying to get a trigger to work with an S3X hub to find that it is possible....but adjustment is beyond finicky.

Guess I'll be dropping the coin to get the right shifter.
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Old 06-18-15, 11:06 AM   #13
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Yeah, get the right shifter for sure! I destroyed the planet pinions and one of the locking balls in my X-RD5 by using the shifter meant for the X-RD5(W), which has a slightly shorter cable pull.
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