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  1. #1
    Nighttime Rider
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    Simple Dahon question(s)

    1. Is the metallic chain guard (on the front crank) supposed to have a ring on both sides
    of the crank or just the outside? Mine came with only an outside chain guard.

    2. I occasionally throw a chain, it seems to be a characteristic of this bike.
    I've seen rollers that may prevent this, any other suggestions?

    CE

  2. #2
    Bromptonaut 14R's Avatar
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    When I got my Giant Halfway I read all reviews available online (not a lot, mabe 3 or 4) and one of he MAJOR complaints was the chain coming out frequently.

    When I went to the local bike dealer and mentioned that, more than one bike tech mentioned that 99% of the chain problems they deal with on a regular basis has to do with poorly assembled bikes. Rear wheel assembly is a deep, intense mix or art, science and experience that almost no difference between perfection and far-from-good-enough.

    in other words, most likely you problem may not be the lack of an "inner guard", unless you are the 1% with a defective product. Just take your bike to a good bike store, give them 10 bucks or so and ask for a rear wheel check-up.

    It worked for me. Halfways have a history of chain problems, I NEVER had mine out (not even once).

    Rafael

  3. #3
    Senior Member Dave Hickey's Avatar
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    It depends on which Dahon model. My Boardwalk came with only an outer guard while my Speed 8 came equipped with both inner and outer guards

  4. #4
    Explorer CaptainSpalding's Avatar
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    Hi CE,

    1.) On my Jet XP the chain guard is only on the outside of the chainring.

    2.) It is because of the shorter chainstay that chain jump is common on bikes with 20 inch wheels. The chainline angle is more obtuse in the highest and lowest gears, and I find that chain jump is the most likely when I skip gears up to the highest gear, when the chain is moving to the smallest sprocket on the cassette and the chain tensioning spring on the derailleur is under the least tension. It definitely helps if I don't skip gears above 6th, and shift up slowly and deliberately, one gear at a time.

    Aside from the roller, here are a couple of other ideas:

    Get another chainguard from Dahon and sandwich the chain on the chainring.
    Convert to hub gears, which has other benefits aside from solving the chain jump issue.
    I came to say I must be folding . . .
    Dahon Jetstream XP
    Dahon Helios SL
    Strida 5.0
    Twenty project


    or not . . .
    Fisher Mt. Tam (c.1988)
    Merlin Road flat bar project
    Schwinn Twinn Deluxe

  5. #5
    Banned. folder fanatic's Avatar
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    I speak from experience. My formerly owned road bikes sometimes had a chain jump problem when I was too fast when changing gears or did not take the time to adjust them when needed. When I started to use internal hub gears on both of my present bicycles (British 3 speed and a Dahon Boardwalk 3 speed) this problem was eliminated. And I gained far more in converting to hub gears now than I ever in those derailleur roadies.

  6. #6
    Senior Member
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    Do a search on this forum (much has been said on these questions by me and others).
    http://www.rhizomes.nl/twenty.html
    My Tweaked and modded Raleigh Twenty. Lots of pictures and lots of general info on for example a different & Cheap Bottom Bracket solution as well as fork solution.

  7. #7
    Banned. folder fanatic's Avatar
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    Quote Originally Posted by CrimsonEclipse
    I wasn't entirely specific. I throw the chain when I leave the trail/road/sidewalk for a
    few feet/yards/miles. The bounce causes the problem. I will purchase an inner ring and
    hardware as a 1st try, second will be a roller.

    I have heard a bit about these internal hubs, my only experience was with an old found
    bike with a 3 speed internal hub. It seems that these hubs have come a long way. So
    now I have a few internal hub questions:

    1. Is there any mechanical loss -vs- derailer?
    2. can I still use the quick release mechanism (will there be an extra steps with rear tire
    removal?)
    3. Is maintenance/reliability easier/harder? (some of the 5 speed hubs have had some
    problems)

    The hub would remove the derailer (easier folding)

    Thanks for all of the info.

    CE
    Both my bikes reflect a 40 or so year span of technological development even though they are the the same model (Sturmey-Archer AW freewheel 3 speed hub-one 1968 and the other 2000 last English made one). As for answers to your questions: 1. While I have read reports of loss of power though the inherent mechanics of using a hub, I personally never felt this. The range of gears are more limited than a derailleur. I find the simplicity of just 3 speeds are quite ample for all the suddenly steep hills surrounding my house. I use the high (3) for fast level sprints, (2) medium gear is perfect for slight grades, and (1) low gear is fine for most 99% of all the hills I encounter. A careful selection of chainring and rear cog is called for each rider's strenght and endurance. (Mine is 44 chainring, 16 cog, 20 inch wheels.)
    As for Question 2, I don't know since my Boardwalk a is rather old fashiioned with non quick released rear hub.
    Question 3 seem to me that you will prefer a 5 speed. I chose the AW model since it's well documented reliability and maintenance is so quick and easy over the 5 speed. A few drops of oil and you are done! And folding without a derailleur is more sure since you don't have to worry about getting out of alignment or even bent or other damage. The hub is far more protective.

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