Dual Sport Trailer assembly thread

Discussion in 'Some Assembly Required' started by The Cheat, Jan 13, 2006.

  1. rapiti

    rapiti IOR Veteran

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    The trailer looks good, but doesn't seem to be a huge improvement over the bobyak. I would probably suggest some triangulation of the tow bar, maybe back to the subframe mounts on your LC4, aligning the pulling forces lower. What about a 29" MTB wheel? If you stuck with 26", there are lots of cheap chinese big box store dual suspension bicycles you could pirate a swingarm/shock off of, if you wanted suspension. A lot of LD bikers swear by the suspended bob over the rigid original. I like your idea, but am not surprised that most has been previously patented. Personally, I would probably buy a closeout Bob, and modify it to suit my needs. Good luck with your project!
    #21
  2. Motoplaner

    Motoplaner PNW Heel Rounder

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    Cheat,
    Looks like a very viable and well done cart. Don’t know about the highway with that wheel but for the trail/gravel roads it looks great.

    [​IMG]

    I can see how that hitch would probably have plenty of strength on the vertical axis but it seems like it might bend were you dragging it uphill, loaded down, through the mud and over a log etc.. maybe not.
    I think the Bobjob hitch is very basic - going through/off of the axle and on a bicycle with no suspension this is a natural but on a bike with perhaps ten inches of suspension travel your design of not going off the axle would be preferred.

    [​IMG]

    Congratulations.
    #22
  3. wheelnut46

    wheelnut46 Been here awhile

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    It looks very lightweight. Tell me, with a rigid design do you find that it bounces a lot when not loaded? I would be interested in seeing video of that trailer in action.
    Good luck with your design. I applaud your desire to fulfill a need.
    #23
  4. The Cheat

    The Cheat Tard

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    It is pretty easy to maneuver while backing up, but does require a little more work. It's really not too bad. I am going to get a video camera to record the whole process (street,dirt, single track, jumping, and turning around on tight dirt roads):jump
    #24
  5. The Cheat

    The Cheat Tard

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    The wheel/Tire combo does pretty well on and off road. It has very strong cartridge bearings that seem to take the weight and speed. I am still going to try some other wheels though. Maybe one made for a little motorcycle like on a 50cc or something.

    Now the hitch I made for my SXC is another story. Your observation is right about being strong on the vertical axis, but it is too flexxy side to side. I plan to make a new one that bolts to the passenger peg mount also. Kinda like a hard case rack.
    #25
  6. Whammo

    Whammo Nature's toothbrush

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    I've seen motorcycles pulling trailers here in CA, but have never thought of the DMV requirements. Does anyone have an idea?
    Man, how nice would it be to get some of my crap off the bike (especially 2-up) and onto a trailer?!?

    Good Stuff. Doesn't look too flimsy to me, just don't overload the sucker.
    #26
  7. vanveen

    vanveen Been here awhile

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    I met a guy from Victoria, B.C. who had a single wheel trailer like that with a mountain bike wheel, he was in the three flag classic, I met him at the Canadain border where he had already been to Mexico and he said it was no problem, never noticed his hitch, but I did look closely at one of those European egg trailers and they had what looked to be a driveshaft U-joint as the coupler
    #27
  8. 01Dakar

    01Dakar n00b

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    Hey, Cheat, I have a small lightweight trailer that was made to be pulled by a motorcycle. I can't figure out a hitch for my BMW yet. I will try to get a picture of the trailer soon and post it.
    #28
  9. The Cheat

    The Cheat Tard

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    Cool lets see it!!! Is it a Unigo?
    #29
  10. wheelnut46

    wheelnut46 Been here awhile

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    Maybe a front wheel/tire from a dirtbike would work well. The rim, axle, bearings etc. would be time proven to the task and assembly/removal would be cake. Also a larger diameter tire is beneficial in many ways. The "forks"-like structure that holds the wheel in place could run horizontal (parallel to the ground) and act as support for the frame.
    Just keeping the ideas flowing.
    #30
  11. The Cheat

    The Cheat Tard

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    I am actually looking into using a motorcycle wheel, but believe t not the 20" freestyle wheel I am currently using is holding up very well. It supports 200lbs. riders who quite often do 5' or 6' jumps on to flat landings. And from what I can tell(haven't measured yet) the axle is the same diameter as a axle on a 50cc motorcycle!! The main reason I hope this wheel proves itself, is weight. It weighs 1/3 of most mini moto wheels. I really want to keep the weight of this trailer down low. The next trailer I am building will be all aluminum and feature rear suspension!!!


    O and the fork like structure already is tied in to the frame for more support. I am going to take some more pictures to show this better, but here is one you can kind of see the rear fork assembly.

    :clap Any ideas are greatly appreciated:clap More input please. Tell me if you love tell me if you hate and why. I want to know.

    [​IMG]
    #31
  12. davorallyfan

    davorallyfan Commonist

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    On yah cheatster,[​IMG]

    I look forward to the next itteration - the suspended version.
    To get a trailer registered for road use in OZ it will need brake lights, indicators and a plate! It will also need to be able to carry a box of beer.

    Dave
    #32
  13. Sasquatch

    Sasquatch Banned

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    I have been facinated with this entire thread. I have been toying with the idea of building a trailer to tow behind my Triumph Tiger for mainly highway duty with the occasional light off road jaunt or two.

    So my needs are thus:
    -Must be stable, and handle high speeds. Thinking about a scooter tire, or sport bike wheel/tire. Something that I can run a radial on for smoother ride.

    -Must have suspension. Been looking at building my own swingarm from box section aluminum and then use a moutnain bike shock. Would give me 4-6" of suspension travel and I can use the threaded spring adjuster to adjust for weight of load.

    -Must carry the load low enough to have a low center of gravity, but high enough to clear off road obsticals that I would encounter (nothing too severe), and offer good cornering clearance.

    -Be lightweight, so I think I will make the frame entirely of aluminum. Hmmmm, maybe a "unibody" type of construction that the case itself is the frame.... Something else to consider..:huh
    #33
  14. The Cheat

    The Cheat Tard

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    The Unibody thing sounds like an interesting idea! I am with you on the MTB shock thing. I have two that I am toying around with. A Fox Alps air shock and a Fox Vanilla coil. Both are made for Mountain bike frames. Question for ya. Do you use a Tig for welding aluminum? I currently have a Miller Matic 210 and I just ordered a Spool gun for aluminum. I have access to a TIG machine, but I am still learning.


    Love to hear more!!!
    #34
  15. Sasquatch

    Sasquatch Banned

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    I only have a Tig. A very nice Lincoln Square Wave Tig. Wish I had a spool gun for some of the heavier stuff though. But tig does a wonderfull job.
    #35
  16. Towpilot

    Towpilot OverVNE

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    :clap Any ideas are greatly appreciated:clap More input please. Tell me if you love tell me if you hate and why. I want to know.

    [​IMG][/quote]

    If you hit a bump just right, will it bounce up & hit you in the back of the head?
    Sorry, couldn't resist.
    -Dan
    #36
  17. The Cheat

    The Cheat Tard

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    If you hit a bump just right, will it bounce up & hit you in the back of the head?
    Sorry, couldn't resist.
    -Dan[/quote]

    No smart ass, but thats very funny!!! It can articulate about 50 degrees up or down from it's normal riding position. Or would that be pulling position?
    #37
  18. sherpa

    sherpa ...Robert

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    I like the idea of an open trailer verses a closed in trailer...more versatile in my mind....

    Aesthetically....I really like the overall form and the frame, but I think the diamond plate is out of place and "dumbs down" your nice piece of sculpture...

    Anything in that open trailer is going to be filthy in short order...so your stuff is going to go in drybags...why not do away with the solid diamond plate in favor of something lighter, and more aesthetically pleasing...
    #38
  19. The Cheat

    The Cheat Tard

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    I have found the front of the trailer needs some sort of protection from roost and mud. I happened to have the aluminum diamond plating and gave it a try. I have been looking for a dry bag bag to put in it. I want something that opens more like a duffel bag. Went to REI didn't find any I liked. I will look in to alternative floor pan and guard material. Thanks for the input.
    #39
  20. koncha

    koncha .

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    I would be interested to see what the 'tongue weight' of that setup is going to be. If you are doing a bob in the attempt to move weight off the bike, I would think you would want to mount the tire on the bob where it would be handling more of the weight instead of the hitch. Just like a car, you are still going to want a percentage of the weight on the hitch so that the thing will steer properly and not give you a negative weight load on the bike.

    Just doing some rough estimates, it looks like up to 20% of the weight on the trailer could be shifted from the bike to the bob wheel by moving the bob wheel up to where the axel is almost even with the back of the load platform.

    However, that might create some adverse effects on your choice of bob wheel. You might need something heavier duty to counter the increased weight load.

    I don't know, just a few thoughts.
    #40