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  1. #1
    Member Guppeh's Avatar
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    Sturmey Archer 130mm into 110mm-wide rear forks?

    Hi folks,

    I recently stumbled upon a good deal for a Sturmey-Archer 3-speed hub, pre-installed in a 20" wheel, which I thought might make a good upgrade to a single-speed folder (original thread below):
    http://www.bikeforums.net/showthread.php?640835

    Well, the wheel finally came in today, and I have some mechanical questions I was hoping someone could help me with. The hub is the SRF3 175mm-wide model (127mm OLD), and it's going into a Schwinn folder with 110mm between the rear forks (knew this when ordering).

    First, there appear to be three spacers total on the axle. On the right (sprocket) side, a dark 3.2mm spacer. On the left side, one dark 3.2mm spacer, and one silver 4.8mm spacer. If I were to take them all out, that would give me an OLD of about 114-115mm. Now, the Sturmey Archer website lists two other variants, a 148mm-wide version with an OLD of 108mm, and a 163mm-wide version with an OLD of 117mm:
    http://www.sturmey-archer.com/produc.../id/17/specs/1

    Apparently, the hub itself is completely the same between the various models. So a few mm get shaved off somewhere, since the spacers aren't enough to count for the extra distance. In an older post on bikeforums:
    http://www.bikeforums.net/archive/in.../t-370402.html
    ...there's a mention about Sheldon Brown narrowing down a hub by using some Sturmey-Archer "skinny nuts". By this, I believe it means the inner cone locknuts, and that there is a thinner type than what is on my hub. If this is correct, Anyone have the model numbers of these thinner nuts, as sites selling these don't seem to list the thickness of the nuts?

    Also, since there is an uneven thickness of spacers on each side being taken out... I asked someone at the local bike shop about the feasibility, and he was concerned that the wheel would be slightly shifted to one side if I did so, and therefore I should only take out an equal amount from the two sides of the axle. How important is it that the wheel be perfectly centered? If I just take out the two black spacers, I will be at about 120mm OLD.

    In addition, the axle ends will end up sticking out too far from the frame, and interfere with folding. I could cut it with an Angle Grinder or Dremel (guy at LBS was willing to try). but I wanted to see if anyone had any suggestions about how practical it would be to do so. A problem is that the indicator chain plugs in to one end of the axle, so that not only would I have to be extra careful not to damage something there or get any metal shavings in the works, I might need a new shorter indicator chain. The shortened axle length probably wouldn't line up exactly with one of the official SA sizes, which might mean problems with lining up the indicator chain's adjustment mark too.

    Also, I would feel kind of bad destroying a 175mm axle, as if the below thread is correct, they aren't widely available SA hubs, and some people need them:
    http://www.bikeforums.net/archive/in.../t-594128.html

    As an alternative, I e-mailed Sturmey-Archer, who suggested I get the correct 148mm axle and put it in (Part HSA621). Unfortunately, not a whole lot of places carry it in the U.S. Is the replacement process sufficiently simple that my LBS wouldn't mind if I asked them to do it? Is there someone with a short axle would needs the long one and would want to swap?

  2. #2
    Gear Hub fan
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    I would go with installing the shorter axle. The other way you mentioned would IMO be a PITA and raise a lot of difficulties.

    There are still some old time bike mechanics around with experience working on SA hubs or the Harris Cyclery web site has instructions as does the Tony Hadland web site. Google for "Harris Cyclery articles" or "Tony Hadland" for instructions. Bikesmith Design does SA work and might have the axle you need and be willing to install it if you are nervous about doing so.
    Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro

    Visit and join the Yahoo Geared Hub Bikes group for support and links.
    http://groups.yahoo.com/group/Geared_hub_bikes/

  3. #3
    Senior Member Grand Bois's Avatar
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    He's not talking about an old SA hub. His is brand new and Taiwan made. It seems that it's much easier to find parts for the old hubs than for the new ones. Some of the old parts fit, including axle nuts and spacers. I would try respacing the hub and shortening the axle to 148mm. The shorter axle will require a shorter indicator chain, but those are readily available. You don't need to be a Sturmey Archer expert to make changes to the outside of the hub.

    The SRF3 is a great hub. I have nothing but good things to say about mine.


  4. #4
    tcs
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    You've completely ruled out cold setting the steel frame and leaving the hub alone, then?

    Any bike shop should be able to get most current Sturmey parts from United Bicycle Supply.

    Quote Originally Posted by Guppeh View Post
    In addition, the axle ends will end up sticking out too far from the frame, and interfere with folding.
    On both sides?

    Best,
    tcs
    Last edited by tcs; 05-08-10 at 05:44 PM.
    "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
    Member Guppeh's Avatar
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    Quote Originally Posted by Grand Bois View Post
    He's not talking about an old SA hub. His is brand new and Taiwan made.
    Yup. the one I got doesn't use the indicator guide axle-nut anymore, apparently. Instead, there's a black plastic guide with a little pully the indicator chain goes over, and a protective cover:
    Sturmey-Archer SR&.jpg

    Quote Originally Posted by Grand Bois View Post
    I would try respacing the hub and shortening the axle to 148mm. The shorter axle will require a shorter indicator chain, but those are readily available
    I found some places that will sell the axle (Apparently, hub is the same as the AW model. The SRF3 just designates an aluminum shell). At least I think this is correct:
    http://smartbikeparts.com/search_det...p?itm=SBP99839
    http://www.sjscycles.co.uk/product-S...A621-19340.htm

    I'm trying to do the whole thing on the cheap, though. The left side is just a solid axle, and shortening it looks pretty simple, just need to cut it off. The right side has the indicator chain coming out of it, and that complicates things a little -- I might just leave that side of the axle alone.

    Quote Originally Posted by tcs View Post
    You've completely ruled out cold setting the steel frame and leaving the hub alone, then?
    Haven't ruled it out, although I was worried that, since it's a 20" bike, the rear forks are pretty short, so the angle change will be quite sharp. Especially considering that the brake bridge is already 1/3 of the way down that already short distance. Still, it might be the easiest option, and I will ask the local bike shop guy his opinion. I'm also wondering if making that big of a change will crack the paint, exposing the metal underneath to rust.

    Quote Originally Posted by tcs View Post
    On both sides?
    Well, on the right side it will prevent it from folding all the way. On the left side, it may stick out a bit more than usual, and I'm worried that will lead to damage from bumping and snagging on stuff. Although, the plastic protective cover might help with that a bit.

  6. #6
    Senior Member randya's Avatar
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    Quote Originally Posted by Guppeh View Post
    Yup. the one I got doesn't use the indicator guide axle-nut anymore, apparently. Instead, there's a black plastic guide with a little pully the indicator chain goes over, and a protective cover:
    Sturmey-Archer SR&.jpg.
    I'm pretty sure you can use an old style indicator chain axle nut on the new hubs

  7. #7
    Senior Member Cassave's Avatar
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    Quote Originally Posted by randya View Post
    I'm pretty sure you can use an old style indicator chain axle nut on the new hubs
    Yes. You can.
    I have an SRF3 with an old style cross drilled indicator nut.

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