Converting Single Speed MU Uno to Double Speed
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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.
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 08:29 PM.
#2
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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..
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 12:23 PM.
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[h=3]Sturmey Archer S2 Duomatic Kick Back Hub ?[/h]
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.
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.
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#7
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Can the item be exported to Singapore? How difficult would it be to install?
#8
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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.
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 07:17 PM.
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#10
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Very nice. Thanks for the info guys.
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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
I just could not get on with the coaster on my city commute.
Its a worthwhile upgrade to the Uno for sure.
Jerry
#12
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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.
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.
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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.
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.
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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.
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
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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.
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 02:33 PM.
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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.
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 ..
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Reviews of the auto-shifting 2spd hubs:
https://mccraw.co.uk/sram-automatix-review/
https://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.
https://mccraw.co.uk/sram-automatix-review/
https://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.
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Reviews of the auto-shifting 2spd hubs:
https://mccraw.co.uk/sram-automatix-review/
https://mccraw.co.uk/sturmey-archer-s2c/
https://mccraw.co.uk/sram-automatix-review/
https://mccraw.co.uk/sturmey-archer-s2c/
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I MUCH prefer the SRAM offering over the S/A having tried both.
Jerry
Last edited by jerrysimon; 01-08-14 at 08:06 AM.
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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
I MUCH prefer the SRAM offering over the S/A having tried both.
Jerry
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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..
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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
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
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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...
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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
Jerry