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Old 07-18-09, 12:53 AM   #1
totalnewbie
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conversion of Dahon Vitesse to single-speed

I have a Dahon Vitesse D7 that I want to convert to a single speed (with coasting ability.) Could anyone recommend a good resource on how to do that? Would converting a Dahon be similar to any bikes, or is that specific things that I should look out for?
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Old 07-18-09, 05:07 AM   #2
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I`ve converted a 2007 Vitesse to single speed. The vitesse has a 110 over-locknut distance, as such a single speed BMX wheel works perfectly. Once you remove the shifter and cable you will need new grips as well. Depending on whether your Vitesse has a derailleur, you may need to shorten the chain.

Hace fun with your single speed!
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Old 07-18-09, 09:08 PM   #3
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The only folder-specific issue would be gearing. The "conventional" singlespeed gearing is about 68"-72". On a 20"-wheeled folder with a 16t BMX freewheel, this means fitting a 60" chainring.
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Old 07-18-09, 09:15 PM   #4
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2007 D7 (non HG) should be 130mm rear.
the easiest way to do it, is to buy a single speed kit and use that, as the rear wheel is a regular freehub style formula hub for shimano 7sp cassettes.

the first part to figure out is if you have a freewheel, or a freehub rear wheel.
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Old 07-18-09, 09:22 PM   #5
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if you have a freewheel, you would have to respace and redish the wheel, then it's all a matter of putting on a SS freewheel that is commonly available as the threads for it are most likely 1.375".
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Old 07-18-09, 10:04 PM   #6
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First of all what Vitesse model do you have? The HG has horizontal dropouts so you won't need a chain tensioner on that model.
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Old 07-18-09, 10:06 PM   #7
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Quote:
Originally Posted by joseff View Post
The only folder-specific issue would be gearing. The "conventional" singlespeed gearing is about 68"-72". On a 20"-wheeled folder with a 16t BMX freewheel, this means fitting a 60" chainring.
??? There are 13T freewheels too.
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Old 07-19-09, 06:22 AM   #8
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Yeah but that means building a new wheel... a Vitesse D7 rear hub is the regular 1 3/8" threaded type IIRC, won't take a 13T FW.
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Old 07-20-09, 10:59 AM   #9
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thanks all for a lot of info but I am confused by the apparently contradictory info. My model is vitesse D7 2007, as in this link.

http://www.dahon.com/archive/2007/us/vitessed7.htm

My motive of changing to a single speed is to shave weight. I have recurring wrist pain and lifting the bike on and off commuter trains is not a pleasant experience. I would like to minimize the weight of the cassette, remove the derailleur assembly but need to keep the freewheel. Not sure how much weight I could save. If the total weight exceeds 1 pound, it could be worth it.
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Old 07-20-09, 11:36 AM   #10
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that's the exact one I have, it uses a shimano spline suntour cassette. 7sp width freehub 28h formula wheel
You will need a single speed conversion kit like this one: http://www.nashbar.com/bikes/Product..._200276_200429

btw, the cranks and bottom bracket in that thing is pretty heavy.
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Old 07-20-09, 12:23 PM   #11
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What else have you done to get the weight down? The rack alone weighs over a kilo. On my 2007 Vitesse D5 the best weight-saving upgrade I made was to switch the seatpost and saddle for a second-hand SDG I-beam model, cutting about half a kilo.
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Old 07-20-09, 12:25 PM   #12
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There are cheap & decent non-folding pedals that would cut 220 grams or so.
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Old 07-20-09, 01:03 PM   #13
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ditch the steel rack it comes stock with and use one of the aluminum arc racks.
you can also chop down the bars so they are a bit narrower.
if you upgrade the wheels and use the schwalbe durano mango or conti GP tyres, that can also save weight.


but my mods are more utilitarian rather than weight savings.
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Old 07-20-09, 03:35 PM   #14
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The handlebar on my vitesse was oddly heavy (238g), don't understand why Dahon would use components like that. I saved 100 grams switching it.

If you keep the seat post but remove the pump you'll shed 200 grams.

The front fender weights 126g.

Kickstand: 178g
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Old 07-20-09, 04:59 PM   #15
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thanks for all the weight saving tips. I don't know why, but my mind was so fixated on the gears that I actually never thought about changing the other parts! I will definitely look into these other components!
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Old 07-21-09, 12:28 PM   #16
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If I use a single speed conversion kit, I suppose using the tensioner is the only way to make sure the chain is taut? (assuming my frame has a vertical dropout) Do all tensioners work the same (I see some are "spring-loaded" and some aren't) and would backpedalling action derail the chain?
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Old 07-21-09, 01:49 PM   #17
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if the chain line is straight, it won't fall off.
you might have to play around with the tensioner as the dahon RD does not fit onto the frame like a normal derailer does and it has vertical drop outs.
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