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Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

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Old 04-08-11, 02:26 PM   #26
Dynocoaster
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That looks great! I like how you renamed it. The belt drive looks great. The new stem looks great too!
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Old 04-08-11, 02:57 PM   #27
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Nice job Roman!! Looks beautiful... I may have to go back out to the woodshed
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Old 04-09-11, 04:50 PM   #28
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Quote "SRAM has officially unveiled its new line line of internal gear hubs at the Taipei Cycling Show. Part of this new line up is the Auto-2 automatically shifting hub. It has adjustable points at speeds 12, 14, and 18 kph. This hub is targeted toward folding and commuter bikes"

We really are being spoilt with these reworked two speed hubs

Regards

Jerry
Holy... YES!!!! Been waiting for someone to do a modern version... so want to do a Mu Duo + This + Gates...
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Old 04-12-11, 06:23 PM   #29
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Whoa, this is pretty much my dream folder right here! How drastic was the gear ratio change when you switched to the belt drive? Do you think a belt drive conversion can be done on the factory Mu Uno single speed hub without being geared down too low?
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Old 04-13-11, 09:22 AM   #30
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darn .... i like even more....
you have 451 wheels correct ?
whats the sprocket on the rear ...

Thanks Thor
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Old 04-13-11, 11:28 AM   #31
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darn .... i like even more....
you have 451 wheels correct ?
whats the sprocket on the rear ...

Thanks Thor
Those are 451s ( he got one of my spares ... but happy it went to a great home ).. rear cog is a 22t Alfine... good luck finding that one other than from Germany..
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Old 04-13-11, 11:32 AM   #32
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Whoa, this is pretty much my dream folder right here! How drastic was the gear ratio change when you switched to the belt drive? Do you think a belt drive conversion can be done on the factory Mu Uno single speed hub without being geared down too low?
You'll be geared very low with current GCD USA inventory and a stock bike.. some customization would be needed depending on your GI choice.
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Old 04-13-11, 04:37 PM   #33
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You'll be geared very low with current GCD USA inventory and a stock bike.. some customization would be needed depending on your GI choice.
PS - Phil Wood makes custom GCD sprockets / cogs...
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Old 04-13-11, 05:46 PM   #34
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PS - Phil Wood makes custom GCD sprockets / cogs...
I think 22t is the lowest tooth count he offers for the Alfine driver... I never inquired if he would custom cut a smaller cog... might be a couple of bucks though.. of course he also does custom sprockets, so there might be some higher tooth counts available for the front also..

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Old 04-13-11, 08:46 PM   #35
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You'll be geared very low with current GCD USA inventory and a stock bike.. some customization would be needed depending on your GI choice.
Meaning to do this I would need a two speed hub?
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Old 04-13-11, 08:55 PM   #36
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I think 22t is the lowest tooth count he offers for the Alfine driver... I never inquired if he would custom cut a smaller cog... might be a couple of bucks though.. of course he also does custom sprockets, so there might be some higher tooth counts available for the front also..
anything bigger in the front would not allow the belt to pass the frame
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Old 04-13-11, 10:26 PM   #37
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anything bigger in the front would not allow the belt to pass the frame
Picky picky picky... ... grinder/file/ idler pulley.. gotta think outside the box
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Old 04-13-11, 10:45 PM   #38
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Meaning to do this I would need a two speed hub?
That would make life a whole lot easier... the stock Uno is (from memory 53/16 or about 62 GI and a 3.3x1 gear ratio) ... Delta Cdrive system could get you close with their 80/25 and a 1200 belt, and a 3.2x1 gear ratio, but you would have to measure carefully and possibly do a little filing.... if it were me, I'd do what Roman and I did, and run a two speed.. I run a Sachs automatic duomatic, and Roman a Sachs kickback duomatic .. and we both run 451 wheels which helps with the gearing.. as you may have read, SRAM is going to release (in a few months) a two speed automatic (probably along the same lines as the Sachs).. that will be one more two speed option..
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Old 04-14-11, 09:52 AM   #39
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I think 22t is the lowest tooth count he offers for the Alfine driver... I never inquired if he would custom cut a smaller cog... might be a couple of bucks though.. of course he also does custom sprockets, so there might be some higher tooth counts available for the front also..
22t maybe, I think, the lowest cog allowed on the GCD. I hear the Gates Centertrack can go down to 16t. So, I really had in mind a larger sprocket.

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anything bigger in the front would not allow the belt to pass the frame
Of course, this picture throws my idea right out...
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Old 04-14-11, 12:13 PM   #40
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lol yeah if it would be that easy ..... even I would have done it ...lol
of course this is a mu ex sport with 8 speed nexus hub..... the frames of the different mu bikes differ a little bit here and there.
but .... maybe something fits better next year ... never know

thor
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Old 04-14-11, 03:00 PM   #41
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Today i finished the Gates Carbon Drive



The bike runs just awesome :-)

I hope you like it...

Greets
Roman
Where did you buy the carbon drive system ? How much does it cost?
Thanks!
Ema
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Old 04-15-11, 01:30 AM   #42
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Hi

thanks for your compliments :-))

I got my GDC Parts here in germany, you can find a lot of information here http://www.g-boxx.com/e-carbondrive.html
The price is another thing, you increase the price of a UNO around 50%

I use 60T front sprocket and 22T rear sprocket which works with the 451 wheels (24 holes front with Bike Friday hub and 28 holes rear, fitting to the 28 holes Duomatik) really good. Its easy to accelerate from zero to around 23 km/h (~15mph) and in 2nd gear i already reached for short time ~30mph.

Her a few more pics

~





To use the GDC with the origional hub and 406 wheel you would need a smaller rear cog or more than 60T front sprocket.

Ill be waiting for the new SRAM Automatik hub. Maybe its a little bit lighter :-))

Greets
Roman
Attached Images
File Type: jpg DSC07586.JPG (93.9 KB, 5 views)

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Old 04-15-11, 12:40 PM   #43
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I got my GDC Parts here in germany, you can find a lot of information here http://www.g-boxx.com/e-carbondrive.html
The price is another thing, you increase the price of a UNO around 50%
Greets
Roman
Mu Uno's aren't too bad of a price to begin with (less than a Trek Soho S, if I recall), so I don't consider this too bad of a hit...
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Old 04-15-11, 12:41 PM   #44
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but .... maybe something fits better next year ... never know

thor
Or, hopefully, Dahon will realize that there's potential for doing this from the factory with the new SRAM A2...
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Old 04-16-11, 12:35 AM   #45
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Very cool!

I also have a Mu Uno and now this thread is possibly inspiring me to do a little tinkering.
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Old 04-17-11, 10:56 AM   #46
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Hi

To use the GDC with the origional hub and 406 wheel you would need a smaller rear cog or more than 60T front sprocket.

Ill be waiting for the new SRAM Automatik hub. Maybe its a little bit lighter :-))

Greets
Roman
Have you installed just the front brake or can you also use the coaster brake?
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Old 04-18-11, 07:35 AM   #47
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Hi

i use the front brake and the coaster brake of the Duomatik. You could install an rear brake like the front brake - but you will have another cabel :-))))

Greets
Roman
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Old 04-18-11, 09:46 AM   #48
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Hi

i use the front brake and the coaster brake of the Duomatik. You could install an rear brake like the front brake - but you will have another cabel :-))))

Greets
Roman
Thanks for the info...I'm quite ready to jump into the carbon drive system...Would you mind telling me the article number of the parts you have used?:

Front sprocket art. no. 10000060
which rear sprocket? (Perhaps I need to wait for the SRAM Automatic 2 speed...What do you think, is the 2nd gear necessary? I'm thinking at this:http://www.sturmey-archer.com/products/hubs/cid/7/id/55 )
Which belt?
Do I need any particular tool for the installation?
Thanks again!!

Last edited by ema74; 04-18-11 at 03:19 PM.
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Old 04-19-11, 12:22 AM   #49
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Hi

here
http://www.g-boxx.com/e-carbondrive.html
can you find a lot of information around the GCD. There are alle measurements you need for your calc and also all numbers

Greets
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Old 10-04-11, 03:33 PM   #50
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Hi Roman,

Really love your bike! I have an Uno myself and would love to put some handlebars on like those! Do you know what the codes/names are for both sets of bars (the first larger set and then the more narrow bullhorn bar you ended up fitting?).

Also, what brake lever is that you've added to the bar? I like it all

Cheers,
Nath
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