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Old 09-07-08, 07:14 PM   #1
tedi k wardhana
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dahon vitesse, from derailer to internal gear conversion??

dear all,
I just acquired a used dahon vitesse, equipped with a 6 speed derailer.
I am planning to convert this into an internal geared hub, just for the sake of a cleaner look.
as I searched the web, it seems that this version of mine is not on the us nor global dahon catalog.
but I see available was a d3 d5 version with internal gear (In Indonesia, I haven't seen them)
What I want to ask is: how does dahon do it? If my frame has a vertical drop out, what do I do with chain tension? I guess horizontal drop outs is best for singlespeed, FIXED, and internal geared hubs.
I feel reluctant to add some more weight by adding a chain tensioner.
also: the hub I already bought prior to the bike, is a sram t3. with a COASTER brake. I am planning to remove all the v brakes. Has anyone done this? How NOT recommended will this set up be? ( I hear noise coming.............)

Please help, dahon vitesse owners!!!
thanks in advance...

tedi k wardhana

-transport, not sport-
-commute, not race-
-vehicle, not toy-
-not just weekends-
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Old 09-07-08, 07:38 PM   #2
tedi k wardhana
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just saw the pictures from another thread.
Mu uno!! (look ma, no brakes!!!!)
hope I can do the same to my vitesse.
(I am not a idea-hijacker, I guess I already had this thought a while back)
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Old 09-07-08, 07:55 PM   #3
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Tedi,

To begin with, you might also take a look at the forum community on the Dahon board for more thoughts and advise. I have a USA Dahon Vitesse D7, and have some literature from Europe from a recent business trip. Don't remember seeing a D6, but that's not to say that such a beast couldn't have been built at some time in the past.

On the subject of conversion, a few things come to mind.

Swapping hubs will require new spokes, as the flange diameters & dishing will be different. That's worth around $25 USD, and you will need some exact measurements to get this right. There is a program called SpoCal on Sheldon Brown's site that I used when making a hub change recently.

The dropout spacing will be different going from a cluster to an internal hub. Some of the 3 speed hubs are as small as 110 mm, and you are probably a bit above that now. Aluminum doesn't like to be cold worked - it tends to crack rather than bend. Spacers may be in order. If the dropouts are truly vertical, you will be dealing with either luck or a tensioner to get the chain tight.

You will need good anti-rotation washers on the hub. This was a problem on some Dahon models with internal hubs. I'm really not sure what the whole issue was on this. And you will need a new shifter & cable arrangement.

I can see possibly dropping the rear handbrake, but please (!) keep the front. Proper technique for shortest distance stopping requires modulation of both the front and the rear brake.
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Old 09-07-08, 07:57 PM   #4
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Quote:
Originally Posted by tedi k wardhana View Post
dear all,
I just acquired a used dahon vitesse, equipped with a 6 speed derailer.
I am planning to convert this into an internal geared hub, just for the sake of a cleaner look.
as I searched the web, it seems that this version of mine is not on the us nor global dahon catalog.
but I see available was a d3 d5 version with internal gear (In Indonesia, I haven't seen them)
What I want to ask is: how does dahon do it? If my frame has a vertical drop out, what do I do with chain tension? I guess horizontal drop outs is best for singlespeed, FIXED, and internal geared hubs.
I feel reluctant to add some more weight by adding a chain tensioner.
also: the hub I already bought prior to the bike, is a sram t3. with a COASTER brake. I am planning to remove all the v brakes. Has anyone done this? How NOT recommended will this set up be? ( I hear noise coming.............)

Please help, dahon vitesse owners!!!
thanks in advance...

tedi k wardhana

-transport, not sport-
-commute, not race-
-vehicle, not toy-
-not just weekends-

You can do it without a chain tensioner, but you need to juggle the chainring/sprocket combo and perhaps incorporate a half-link for the chain to attain proper tension .. otherwise, you'll need a chain tensioner (singulator or the like) or change to an eccentric bottom bracket to allow precise chain tension.. here's my JetXp (vertical drops) at one point in it's life..

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Old 09-07-08, 09:18 PM   #5
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Another point: You can't use a coaster brake with any kind of chain tensioner.
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Old 09-08-08, 07:42 AM   #6
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Another point: You can't use a coaster brake with any kind of chain tensioner.

How very true! I had to think about this for a minute in order to see the obvious.
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Old 09-08-08, 11:11 AM   #7
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If you loosen the hub, the chain will come right off. Then you simply have to loosen the spring flange.
It shouldn't take more than 10 minutes to get it apart.
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Old 09-08-08, 12:56 PM   #8
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A rough measurement of the dropout spacing measured at lunchtime shows around 125 mm (one and a half photo ID cards, or so...). Not as wide as I thought it would be, but still wider than the last internal 3spd with coaster hub I mounted. I was thinking about a standard sized bike that would have been quite a bit wider.
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Old 09-08-08, 11:23 PM   #9
tedi k wardhana
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Originally Posted by Fibber View Post
Another point: You can't use a coaster brake with any kind of chain tensioner.

How very true! I had to think about this for a minute in order to see the obvious.
I had to think for a while too.
thanks!

so, we have come to a temporary conclusion, NOT to use a chain tensioner.
but the question still remains, and I hope vitesse d3/d5 owners can answer:

how does dahon officially do it?
does it mean that they make TWO versions of the frame?
one with a vertical drop out, the other with a horizontal one?
or they use eccentric bottom bracket?
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Old 09-09-08, 01:13 AM   #10
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You can disable the coaster brake, use a chain tensioner and use the T3 just for the gears.
See:
coaster brake removal ? from a new guy
if you remove the coaster brake arm, will it just be a freewheel?

Some hubs make dis-/reassembly difficult apparently, see:
Removing coaster brake from Nexus 7-speed hub?

You might want to contact dober, he seems to know his stuff.
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