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  1. #1
    Senior Member kabex's Avatar
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    Dahon Mu Uno Gates CenterTrack WeightWeenie Conversion?

    Hi all

    I've been meaning to get a folder for quite a while now, I'm currently riding a Trek District Belt-Drive, and I LOVE it.

    I can't go back to a chain, ever. I thought about getting a folder with some decent upgradeability and I just read a thread about a guy here who converted a Mu Uno to a 2-speed belt driven bike. It was AWESOME.

    I got an idea, is it possible with the new CenterTrack technology to keep the stock wheels and go down to a 19 tooth and make it a rideable gearing? The new CenterTrack thing allows for a lower 19 tooth cog instead of 22 like the previous one(at least that's what I think):


    Here's their gear inches calculator (60 tooth front, 19 tooth rear, 20" wheels)


    With that gearing you get 22-25kph @80-90rpm, pretty decent. I don't need more than that.

    Another thing is that I'd want to get some Kinetix wheels (1000g for the set) + light seat post/saddle and maybe some light bars.

    I think it'd be possible to bring it down to 8kg or lower easy (10kg stock minus 2kg+ for some kojaks, kinetics, lighter seatpost and saddle).

    Can I use the 19 tooth centertrack cog on these wheels?
    http://www.premiumbikegear.com/speci...ear-wheel.html

    I'd want to do the belt drive conversion first then go for the lighter parts of course. A cool idea would be the Sram Automatix Coaster Brake hub with no brakes(although it weighs some 1.1kg, so a bit of a weight penalty).


    What do you guys think?

  2. #2
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    Hi,

    Go on diet and lose 2Kg, its a lot cheaper.

    Never ride without a good front brake.

    rgds, sreten.

  3. #3
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    Quote Originally Posted by kabex View Post
    Hi all

    I got an idea, is it possible with the new CenterTrack technology to keep the stock wheels and go down to a 19 tooth and make it a rideable gearing? The new CenterTrack thing allows for a lower 19 tooth cog instead of 22 like the previous one(at least that's what I think):
    I think you'll want to revisit what's available... that 19t CenterTrack cog you reference fits a Rohloff hub .. cogs you need would be those designed for the Alfine (24t availability). which are 3 dog to fit Sram/Sachs/Shimano/Sturmey IGH and single speed..




    Quote Originally Posted by kabex View Post
    Another thing is that I'd want to get some Kinetix wheels (1000g for the set) + light seat post/saddle and maybe some light bars.
    The Kinetix wheels (130mm rear spacing) won't work in the Uno (120mm rear spacing).. whatever hub you use will need to fit 120mm rear spacing.





    Quote Originally Posted by kabex View Post

    Can I use the 19 tooth centertrack cog on these wheels?
    http://www.premiumbikegear.com/speci...ear-wheel.html
    No

    Quote Originally Posted by kabex View Post

    I'd want to do the belt drive conversion first then go for the lighter parts of course. A cool idea would be the Sram Automatix Coaster Brake hub with no brakes(although it weighs some 1.1kg, so a bit of a weight penalty).
    The SRAM Automatix is a great choice (as would be it's predecessor the Sachs Duomatic/Automatic) .. I run both on a couple of bikes .. and as mentioned by another poster, you'd want to have a front brake in addition to a coaster brake..

    Bruce

  4. #4
    PatronSaintOfDiscBrakes dynaryder's Avatar
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    Quote Originally Posted by BruceMetras View Post
    and as mentioned by another poster, you'd want to have a front brake in addition to a coaster brake..
    +2

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

  5. #5
    coprolite fietsbob's Avatar
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    You Show a Rohloff Cog ..

    R'off cog FYI, threads on it's a M34x6 * on inside it has a surface that an oil seal contacts,

    Different, i suspect, than the typical hub thread.. ( their fixie cog is a 21t)

    you might be able to fake it with the Shimano cog version .on one of Bromptons .
    they use that spline type now.. on their single /2 cog free-hubs.. 28 spoke..
    [those wheels that you linked to.. all have a wider freehub driver than you really need..]

    They show a 20t in 9 spline type..
    By the way got the tensioning the belt method, sorted out in your plans?

    need 2 brakes if its not the fixie. . then you could get away with just the front..

    http://www.carbondrivesystems.com/pr.../cdxsprockets/
    Last edited by fietsbob; 07-03-13 at 07:23 PM.

  6. #6
    Senior Member kabex's Avatar
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    Quote Originally Posted by fietsbob View Post
    You Show a Rohloff Cog ..

    R'off cog FYI, threads on it's a M34x6 * on inside it has a surface that an oil seal contacts,

    Different, i suspect, than the typical hub thread.. ( their fixie cog is a 21t)

    you might be able to fake it with the Shimano cog version .on one of Bromptons .
    they use that spline type now.. on their single /2 cog free-hubs.. 28 spoke..
    [those wheels that you linked to.. all have a wider freehub driver than you really need..]

    They show a 20t in 9 spline type..
    By the way got the tensioning the belt method, sorted out in your plans?

    need 2 brakes if its not the fixie. . then you could get away with just the front..

    http://www.carbondrivesystems.com/pr.../cdxsprockets/
    So a 20 tooth is an option then?

    Hmmm, as for the rear wheel too bad. I could buy just the front.

    Still, I think it's pretty easy to get it to 8kg.

    The belt drive saves 200 grams over a chain, and the aforementioned cog is 58 grams vs something like 150 for a SS cog.

    Even without the SRAM Automatix, a 60-20 ratio would give us 60 gear inches, which I think is pretty decent for a short distance city only folder bike.

    10kg stock + light front wheel, belt drive, lighter tyres & seatpost+saddle would save us a bit over 1.5kg

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