Instructables
I wanted to recycle an old foldaway bike I used for an earlier recumbent project to make a one wheeled trailer. I was inspired by an earlier instructable but didn't want to do any welding, just nuts and bolts. I'm a big fan of 1/2" conduit for lots of metal projects. This project took about 2 weeks off and on. I'm going to use it when I bike around town or to the beach for the day and carry lunch, drinks, boom box, etc. It's not meant for heavy loads. That's another project for another time.
 
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Step 1: Modifying The Frame

Here's a shot of the under side. I cut the existing frame and modified the vertical angle of the handlebar collar to be perpendicular with the ground so it wouldn't jam up when it pivoted. Geometry is critical here.I had to used plate steel and bolts to join the frame because of no welder. I reinforced the 1/2" plywood top with sections of 1/2" conduit that where flattened and bent in my bench vise. They were secured to the frame with sheet metal screws and eye bolts. I used cap nuts to finish the connections off to look right.

Step 2: Hitch Mechanism

Now for the hitch. I picked up some ideas from other trailer designs I found on the web and hoped my conduit would hold up. It seems to work fine. Here's the details: I used a 3/4" piece of steel plumbing pipe and 2 caps to join everything together. It was great, no excess wobble in the collar or up and down motion. Whisper quiet. The hitch resembles a triangle shape which is very ridged. 1/4" bolts everywhere. The sectioned where cut, flattened and bent in my bench vise. The edges were ground to look nice. I had to estimate the space needed for the tire and distance to the trailer.
andrea biffi2 months ago

That is really awesome, too bad it was not featured five years ago, but never say never... ;-)

I just built one I love it!!! The thing I added to make it cool was styrafoam pipe insulation around the edge it makes it look cool and its safer.
yyinfo2 years ago
Thanks,I like it,have fun !
BillBiker3 years ago
I have been looking at similar projects I must say this one should have received some sort of recycling or green award. VERY NICE JOB!
thetoolman (author)  BillBiker3 years ago
Thanks, can you send me a badge?
Done :)
TSC3 years ago
Nice job man!
zack2474 years ago
im looking at the hitch, and i like it! i see that the hitch is a ballbearing from the front fork of the bike. i think i'll do something like this, but with 2 wheels
eagleapex4 years ago
 Using the screw eyes as structure is brilliant. Elegant design.
thetoolman (author)  eagleapex4 years ago
Thanks. I've since retired this for a two wheeled version. Just too unstable on tight turns.
eagleapex4 years ago
 Real quality build here. Great job!
jamar30305 years ago
It looks like you used a head tube (instead of steel plumbing pipe) from a bicycle here as your horizontal pivot and welded it to the trailer. Is the steel pipe inside the head tube?
yeah it does look like a headtube
...it is...but it's vertical,not horiz...
anyoldmouse4 years ago
Do you have some kind of conduit squishing tool? I see the kink in the rail going to the hitch, so I know that you didn't use a bender for that part, but you have this getting down to a flat piece of metal (very clean) wherever you put in a bolt. I haven't worked with conduit before, so I don't know. Do you put it in a vise?
thetoolman (author)  anyoldmouse4 years ago
Just used the trusty vise.
thetoolman (author)  anyoldmouse4 years ago
Sorry for the late reply, yes, I use the vise for bending all of my conduit.
How did you flatten the ends? I'm imagining a vise and a cheater bar for more leverage or that you have access to a press.
bosmith5 years ago
Cool. Nice hitch.