Single Wheel Dual Sport Trailer - CRF250L

Discussion in 'Some Assembly Required' started by Lapchik, Jul 17, 2019.

  1. Lapchik

    Lapchik Tinkeritis posterboy

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    I was too excited to wait, so I took it for a test ride tonight. The cooler has my rain gear, tools, and warm base layers in it. Driving it feels like I have my daughter on the back, but with a different center of gravity. Acceleration didn't get reduced much. At 65 mph, it has a slight wobble. I'm not sure if it is due to the cooler, or if something is a little loose, or [my best guess] the wear on the tire is making it tip from one side to the other. It seems to have some camber wear on one side more than the other. The picture is a little blurry, but you can see it. More slope on the right side.

    64.JPG

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    #41
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  2. flinders_72

    flinders_72 Long timer

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    Correct me if I'm wrong, but there's no vertical pivot anywhere between the bike swingarm pivot and the trailer swingarm pivot, eg, anywhere along the yellow line here? That may be problematic.

    KIMG2659.JPG
    #42
  3. brownvv

    brownvv Been here awhile

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    It pivots at the rear axle of the bike
    #43
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  4. brownvv

    brownvv Been here awhile

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    This build is impressive. I hope you build a crf500l. Pretty sure you could do it justice
    #44
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  5. phreakingeek

    phreakingeek adventurer Super Supporter

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    wow, that trailer is built like a tank. Any idea how much it weighs?
    #45
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  6. Lapchik

    Lapchik Tinkeritis posterboy

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    Vertical pivot bolts are right behind the axle
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  7. Lapchik

    Lapchik Tinkeritis posterboy

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    Just under 47 lbs
    #47
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  8. Lapchik

    Lapchik Tinkeritis posterboy

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    Made a quick video to show it all together and hooked up

    #48
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  9. budsboy

    budsboy I crashed the swing too. Supporter

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    One fact learned (the hard way) a long time ago is to be redundant when strapping things down.
    Trailer looks great!
    #49
  10. Lapchik

    Lapchik Tinkeritis posterboy

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    74 miles on the trailer as of tonight / this morning. Whatever, working nights makes me always question what day it actually is. I ended up lowering the suspension about an inch and a half to eliminate the highway speed wobble I was experiencing. That pretty much fixed it. The rest of it was just getting used to how it feels to pull a trailer. It's not like it's a difficult new skill to learn, it's just like if you're used to riding one bike, and you get on your buddy's bike, it feels completely different. After about 20 miles, I felt fine and confident with the trailer behind me. Pull straight, pulls easy. I appear to be getting about the same gas mileage as when I had all the luggage on the bike.
    #50
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  11. flinders_72

    flinders_72 Long timer

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    Yes, I'd read that part the day before I asked the question! Dunno why I didn't remember it. I'm thinking of building one to tow my pet greyhound around behind my RT, only problem is exhaust fumes, which is something I'll need to overcome. I'll probably end up making something similar to yours but taller, so her head's way above the muffler height, and also put a downpipe on the exhaust outlet.
    #51
  12. tomrux

    tomrux Been here awhile

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    The wobble is reduced if the axis for the vertical pivot is canted forward at the top, 10 or 15 degrees is the norm. Makes it caster.

    Cheers Tom R
    #52
  13. scot_douglas

    scot_douglas Dirt Harley Lovin' Supporter

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    You could hit up just about any KTM690 owner and ask for their stock muffler with catalytic converter. :)
    #53
  14. OU812

    OU812 Legend in my own Mind! Supporter

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    Fuk Cats!;)
    #54
  15. Lapchik

    Lapchik Tinkeritis posterboy

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    KIMG2893.JPG
    #55
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  16. drmrhonda580

    drmrhonda580 n00b Supporter

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    Hi, awsome trailer !! Got me thinking - wonder if it would be legal here in the UK ? Love the design and engineering ! :clap:clap

    regards DR
    #56
  17. franko58

    franko58 Been here awhile

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    In this thread http://www.britbike.com/forums/ubbt...ds/trailers/Search/true/re-finally#Post421222 3 one wheel trailers are pictured.
    The first one, I think, is a PAV-40 http://www.singlewheel.com/Scoots/PAVFR.htm it is similiar to Uni-go http://www.uni-go-trailers.com/TrailerUni-go.html
    The other two are home built, but the photobucket blur makes them hard to see.
    The upper of the two trailers uses a large ammo can as its cargo area and I THINK it is a stressed member of the trailer. I can't tell from the blurred picture and it has been a long time since I looked at this thread.
    So to answer your question about being legal in the UK, I would think so as that is where these people live.
    #57
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