Advertise on Bikeforums.net



User Tag List

Results 1 to 12 of 12
  1. #1
    Junior Member
    Join Date
    Apr 2011
    Location
    Dubuque, IA
    My Bikes
    All City Nature Boy
    Posts
    12
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    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.

  2. #2
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    3,092
    Mentioned
    44 Post(s)
    Tagged
    0 Thread(s)
    n/m

    no engineering degrees or lab , I just fix stuff.
    Last edited by fietsbob; 11-23-11 at 10:35 AM.

  3. #3
    Senior member Dan Burkhart's Avatar
    Join Date
    Oct 2004
    Location
    Oakville Ontario
    Posts
    5,138
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)
    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.
    Gearhubs demystified and other cool stuff.


    The greatest mistake you can make in life is to be continually fearing you will make one. Elbert Hubbard.

  4. #4
    tcs
    tcs is offline
    Palmer tcs's Avatar
    Join Date
    Mar 2007
    Location
    Parts unknown
    Posts
    4,353
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    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
    "When man first set woman on two wheels with a pair of pedals, did he know, I wonder, that he had rent the veil of the harem in twain? A woman on a bicycle has all the world before her where to choose; she can go where she will, no man hindering." The Typewriter Girl, 1899.

    "Every so often a bird gets up and flies some place it's drawn to. I don't suppose it could tell you why, but it does it anyway." Ian Hibell, 1934-2008

  5. #5
    tcs
    tcs is offline
    Palmer tcs's Avatar
    Join Date
    Mar 2007
    Location
    Parts unknown
    Posts
    4,353
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fietsbob View Post
    S-A was founded in 1909.
    1902.
    "When man first set woman on two wheels with a pair of pedals, did he know, I wonder, that he had rent the veil of the harem in twain? A woman on a bicycle has all the world before her where to choose; she can go where she will, no man hindering." The Typewriter Girl, 1899.

    "Every so often a bird gets up and flies some place it's drawn to. I don't suppose it could tell you why, but it does it anyway." Ian Hibell, 1934-2008

  6. #6
    Senior Member oldroads's Avatar
    Join Date
    Feb 2002
    Location
    Massachusetts
    Posts
    642
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Length depends on the bike’s frame, plus where you put the fulcrum sleeve.
    Why not use a standard S/A shifter?
    Vinny - Menotomy Vintage Bicycles - OldRoads.com
    BUY/SELL forum (no fees) - Price Guides - 19 years of archives

  7. #7
    Senior member Dan Burkhart's Avatar
    Join Date
    Oct 2004
    Location
    Oakville Ontario
    Posts
    5,138
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)
    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.
    Last edited by Dan Burkhart; 11-22-11 at 10:23 AM.
    Gearhubs demystified and other cool stuff.


    The greatest mistake you can make in life is to be continually fearing you will make one. Elbert Hubbard.

  8. #8
    Senior member Dan Burkhart's Avatar
    Join Date
    Oct 2004
    Location
    Oakville Ontario
    Posts
    5,138
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)
    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.
    Last edited by Dan Burkhart; 11-22-11 at 10:26 AM.
    Gearhubs demystified and other cool stuff.


    The greatest mistake you can make in life is to be continually fearing you will make one. Elbert Hubbard.

  9. #9
    tcs
    tcs is offline
    Palmer tcs's Avatar
    Join Date
    Mar 2007
    Location
    Parts unknown
    Posts
    4,353
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote 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.
    "When man first set woman on two wheels with a pair of pedals, did he know, I wonder, that he had rent the veil of the harem in twain? A woman on a bicycle has all the world before her where to choose; she can go where she will, no man hindering." The Typewriter Girl, 1899.

    "Every so often a bird gets up and flies some place it's drawn to. I don't suppose it could tell you why, but it does it anyway." Ian Hibell, 1934-2008

  10. #10
    Senior member Dan Burkhart's Avatar
    Join Date
    Oct 2004
    Location
    Oakville Ontario
    Posts
    5,138
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by tcs View Post
    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.
    Gearhubs demystified and other cool stuff.


    The greatest mistake you can make in life is to be continually fearing you will make one. Elbert Hubbard.

  11. #11
    Junior Member
    Join Date
    Apr 2011
    Location
    Dubuque, IA
    My Bikes
    All City Nature Boy
    Posts
    12
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    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.

  12. #12
    Senior member Dan Burkhart's Avatar
    Join Date
    Oct 2004
    Location
    Oakville Ontario
    Posts
    5,138
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)
    Quote 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.
    Gearhubs demystified and other cool stuff.


    The greatest mistake you can make in life is to be continually fearing you will make one. Elbert Hubbard.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •