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  1. #1
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    Converting Single Speed MU Uno to Double Speed

    My wife is getting a Bromptons soon, so I thought I'll splurge a little and upgrade my MU Uno to a two-speed so I'd have less trouble keeping up.

    I'm pretty much a complete newbie to mods, so I'd like to know what are cheap and/or reliable options in this case?

    Thanks in advance.
    Last edited by keyven; 01-05-14 at 07:29 PM.

  2. #2
    coprolite fietsbob's Avatar
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    how about a kickback coaster brake 2 speed.. new wheel..

    non mechanical ? have a bike shop do the order & swap.


    with out a fixie kit, to slow with resisting pedal rotation,
    there needs to be some rear brakes..
    Last edited by fietsbob; 01-07-14 at 11:23 AM.

  3. #3
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    Sturmey Archer S2 Duomatic Kick Back Hub ?

    Just did a quick google and this sounds good, especially since my Uno is outfitted with front hand-brakes as well. From the review it sounds a little worrying if you have to rely solely on backpedaling to brake and gear-shift.

  4. #4
    coprolite fietsbob's Avatar
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    SRAM has 1 too.

  5. #5
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    Quote Originally Posted by fietsbob View Post
    SRAM has 1 too.
    Will any of these hubs affect the fold? I walked into a random bike shop carrying Dahons and they said they can do it (using a hub whose brand I can't remember), but they said it may make the bike difficult or impossible to fold.

  6. #6
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    Quote Originally Posted by keyven View Post
    Will any of these hubs affect the fold? I walked into a random bike shop carrying Dahons and they said they can do it (using a hub whose brand I can't remember), but they said it may make the bike difficult or impossible to fold.
    You might want to have a chat with www.thorusa.com. He offers a SRAM Automatix wheel for your UNO.

  7. #7
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    Can the item be exported to Singapore? How difficult would it be to install?

  8. #8
    coprolite fietsbob's Avatar
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    Ever owned a bike with a coaster brake?

    Reaction arm has a strap that wraps around the left chainstay.. 1 small bolt connects the 2.

    that and the axle nuts,, is all there is ..
    buy it from Thor who sells Dahons and it will fit.

    He will quote Shipping cost.
    Last edited by fietsbob; 01-06-14 at 06:17 PM.

  9. #9
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    Quote Originally Posted by keyven View Post
    Can the item be exported to Singapore? How difficult would it be to install?
    It's easy to install.. drops right in .. If I'm in Singapore, I'd hunt up my favorite Dahon/Tern bike shop and have them build up another rear wheel with the SRAM automatic 2 speed hub.. here's mine.. with belt drive added.. but chain drive is easier to set up ..


  10. #10
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    Quote Originally Posted by BruceMetras View Post
    It's easy to install.. drops right in .. If I'm in Singapore, I'd hunt up my favorite Dahon/Tern bike shop and have them build up another rear wheel with the SRAM automatic 2 speed hub.. here's mine.. with belt drive added.. but chain drive is easier to set up ..
    Very nice. Thanks for the info guys.

  11. #11
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    I started by upgrading with a SRAM A2 with coaster brake but have since put the rear cable brake back on and gone for a SRAM A2 freewheel/no coaster brake.

    I just could not get on with the coaster on my city commute.

    Its a worthwhile upgrade to the Uno for sure.



    Jerry
    Brompton M2L (SRAM A2), Brompton M2L(X), Dahon Uno (SRAM A2), Both Swift Xootr & Moulton TSR2 now gone

  12. #12
    Mister Bleak! mconlonx's Avatar
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    I'm surprised fietsbob didn't also mention the possibility of a 2sp crank.

    Truvative does the Hammerschmidt, but I don't think it will fit without specific bb mounting hardware the Mu does not have. They used to make a 2sp crank called the Metropolis, which was the non-mtn bike version and would fit right up -- if you can find one of these on closeout somewhere, it might be a great deal and quite possibly cheaper than a new wheel.

    There's also Schlumpf 2sp cranks, but they are a bit pricey...

    OP, if you go with the Sturmey Archer S2C or S2, keep in mind that you get stock gear ratio plus an overdrive geared ratio. Meaning, if you set up your bike with the same sized sprockets you have stock, the gear you gain will be higher. Most people doing gears want them for an easier gear, so the trick to these is to adjust the drive cog out back and chainring up front to where you want the shifting to end up.
    Quote Originally Posted by Six jours View Post
    Bottom line: everyone here should listen to Mconlonx... he has it figured out and the rest of you, well, don't.
    I know next to nothing. I am frequently wrong.

  13. #13
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    Quote Originally Posted by mconlonx View Post
    I'm surprised fietsbob didn't also mention the possibility of a 2sp crank.

    Truvative does the Hammerschmidt, but I don't think it will fit without specific bb mounting hardware the Mu does not have. They used to make a 2sp crank called the Metropolis, which was the non-mtn bike version and would fit right up -- if you can find one of these on closeout somewhere, it might be a great deal and quite possibly cheaper than a new wheel.

    There's also Schlumpf 2sp cranks, but they are a bit pricey...

    OP, if you go with the Sturmey Archer S2C or S2, keep in mind that you get stock gear ratio plus an overdrive geared ratio. Meaning, if you set up your bike with the same sized sprockets you have stock, the gear you gain will be higher. Most people doing gears want them for an easier gear, so the trick to these is to adjust the drive cog out back and chainring up front to where you want the shifting to end up.
    My eyes just kinda glazed over at the tech-speak lol. So far the Sturmey Archer S2 and SRAM 2 (assuming they are different) keeps popping up. I'm just going to call a few stores and ask them about these. They seem to be relatively safe and popular choices. I'm more a visual kinda guy so I'll learn better once they're showing me the parts.

  14. #14
    Senior Member smallwheeler's Avatar
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    Quote Originally Posted by keyven View Post
    My eyes just kinda glazed over at the tech-speak lol. So far the Sturmey Archer S2 and SRAM 2 (assuming they are different) keeps popping up. I'm just going to call a few stores and ask them about these. They seem to be relatively safe and popular choices. I'm more a visual kinda guy so I'll learn better once they're showing me the parts.
    1. you don't want a coaster brake. one of the great things about not being 9 years old is that we no longer have to ride bikes with coaster brakes.

    2. Singapore has great bike shops that can build any wheel your heart desires. no need to order a wheel from the US that's built using parts manufactured in Taiwan or China. that would be silly.

    3. "stock gear ratio plus overdrive" as mentioned above means that whatever gear you currently have, a two-speed conversion will give you a second gear that's higher, i.e., more difficult to pedal. you and your bikeshop can adjust the 2 resultant gear ratios to your liking by choosing the size of the rear cog- the larger the rear cog, the easier it is to pedal. the range of cog sizes for the sturmey archer 2 speed hub is 14 teeth to 22 teeth.

  15. #15
    coprolite fietsbob's Avatar
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    Yea Sclumpf, made in , Swizerland , cannot be made as cheaply, as the Asian countries do ..
    the CHF , being the home of numbered accounts of every despot and tax evader, around the world,
    has a hard time in Manufacturing because of Strong Currency Valuations, too.

    SRAM , shifted production , on Taiwan, has some 1.6x overdrive cranks,
    though aimed at the Hardcore MTB market

    and The Patterson Metro are also the same sort of small chainring ,
    turning faster than the cranks sort of thing .

    more easily used on Hybrids with bigger wheels.
    Last edited by fietsbob; 01-08-14 at 01:33 PM.

  16. #16
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    Quote Originally Posted by keyven View Post
    My eyes just kinda glazed over at the tech-speak lol. So far the Sturmey Archer S2 and SRAM 2 (assuming they are different) keeps popping up. I'm just going to call a few stores and ask them about these. They seem to be relatively safe and popular choices. I'm more a visual kinda guy so I'll learn better once they're showing me the parts.
    Big differences between the Sturmey S2 and the SRAM Automatix ..

    The Sturmey shifts by you back pedaling a few degrees, and then proceed forward.. if you are in high and backpedal, you are in low .. if in low and backpedal, then in high .. if you have a coaster brake hub, whenever you engage the brake by backpedaling, you also shift from what ever gear you were in.. they also have many reported problems since their introduction across the web..

    The SRAM Automatix shifts automatically with wheel revolution, and at a pre-determined point .. stock, on a 406 wheel it would shift around 6 to 8 mph.. the A2 can be modified to shift later (mine shifts at around 14mph) .. but that is a usually done by the mechanically inclined, whether an individual or shop.. I happen to love the Automatics and coaster brake setups ( I have two that I run frequently) I also use a Moulton TSR-5 (SRAM P5 5 speed, belt drive, coaster brake) bike as my daily ride .. although some can't get on with a coaster brake, they do have distinct advantages for me.. the SRAM also has an excellent reliability record ..

  17. #17
    PatronSaintOfDiscBrakes dynaryder's Avatar
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    Reviews of the auto-shifting 2spd hubs:
    http://mccraw.co.uk/sram-automatix-review/
    http://mccraw.co.uk/sturmey-archer-s2c/

    If you search around in this forum,there's also been a couple postings on converting Dahon Uno's to 2spds.

    C'dale BBU('05 and '09)/F600/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes/Novato,Giant Defy 1,Schwinn DBX SuperSport/Qualifier,Brompton S6L,Dahon Speed Pro TT

  18. #18
    Senior Member smallwheeler's Avatar
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    Quote Originally Posted by dynaryder View Post
    ugh...

  19. #19
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    Quote Originally Posted by BruceMetras View Post
    .. but that is a usually done by the mechanically inclined, whether an individual or shop.
    If you use the SRAM A2 on a smaller wheel i.e. 20" or lower this is almost mandatory or it will change too quickly. I have mine set to change about 12mph. As stated for the mechanical minded only as you do have to open up the unit and adjust the spring. Details of how are on the links already posted I think.

    I MUCH prefer the SRAM offering over the S/A having tried both.

    Jerry
    Last edited by jerrysimon; 01-08-14 at 07:06 AM.
    Brompton M2L (SRAM A2), Brompton M2L(X), Dahon Uno (SRAM A2), Both Swift Xootr & Moulton TSR2 now gone

  20. #20
    Senior Member smallwheeler's Avatar
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    Quote Originally Posted by jerrysimon View Post
    If you use the SRAM A2 on a smaller wheel i.e. 20" or lower this is almost mandatory or it will change too quickly. I have mine set to change about 12mph. As stated for the mechanical minded only as you do have to open up the unit and adjust the spring. Details of how are on the links already posted I think.

    I MUCH prefer the SRAM offering over the S/A having tried both.

    Jerry
    what was your experience with the SA hub on your moulton?

  21. #21
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    Quote Originally Posted by smallwheeler View Post
    what was your experience with the SA hub on your moulton?
    It was rubbish

    Seriously the first ones seem to lock up and kick back gear changing was unpredictable. I think the later ones were better but by then I had moved to using the SRAM A2.

    Jerry
    Brompton M2L (SRAM A2), Brompton M2L(X), Dahon Uno (SRAM A2), Both Swift Xootr & Moulton TSR2 now gone

  22. #22
    Senior Member smallwheeler's Avatar
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    Quote Originally Posted by jerrysimon View Post
    It was rubbish

    Seriously the first ones seem to lock up and kick back gear changing was unpredictable. I think the later ones were better but by then I had moved to using the SRAM A2.

    Jerry
    sucks. i just bought one a couple of weeks ago and was preparing to lace it to a rim that just arrived. bummer. usually, i am a very research intensive type, but for some reason i just bought this hub on impulse as it seemed perfect for what i wanted to do. dammit..

  23. #23
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    I think they have sorted out the problems now

    Their advantage over the SRAM is you choose when you want to change gear. The disadvantage over the SRAM is that the SA is always in the higher gear when you brake to stop.

    Jerry
    Brompton M2L (SRAM A2), Brompton M2L(X), Dahon Uno (SRAM A2), Both Swift Xootr & Moulton TSR2 now gone

  24. #24
    Senior Member smallwheeler's Avatar
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    Quote Originally Posted by jerrysimon View Post
    I think they have sorted out the problems now

    Their advantage over the SRAM is you choose when you want to change gear. The disadvantage over the SRAM is that the SA is always in the higher gear when you brake to stop.

    Jerry
    thanks for that encouragement

    yes, i didn't like the idea of automatic shifting that's why i chose the SA. also, i didn't opt for the kick-brake version for the reason you've mentioned. now, i just wonder if it is going to worth the effort of ordering spokes and lacing this thing up. well, i guess if it sucks i can always replace it with a SA 3 speed hub. i think the hub flanges and spacings are the same...

  25. #25
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    I sold my SA easily and also the SRAM A2 with the coaster when I replaced that with the freewheel one. People snap them up, even quicker when they are already laced into a rim

    Jerry
    Brompton M2L (SRAM A2), Brompton M2L(X), Dahon Uno (SRAM A2), Both Swift Xootr & Moulton TSR2 now gone

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