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Can I build a bicycle cargo trailer using a Hitchhiker child's seat attachment as the base? Answered


I'm trying to build a bicycle cargo trailer. I was talking with a guy at my local hardware store about what I could use for a wheel base. He found a used Hitchhiker child's bicycle seat attachment frame and sold it to me for cheap. He said it was a child carrier, but on closer inspection I've found that it's just an attachment that adds an extra seat to your bike for a child to sit on. From looking at it I can't tell how I could fit the components of a cargo trailer on it and I can't find instructions for how to use it on Instructables. 

Any ideas?
Thanks a lot!

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user
orksecurity (author)2011-03-16

I'd give that a resounding "maybe". Certainly if it can carry a child it can carry something of child-like mass. If you dismount the pedals you could install large pannier-style storage on either side; if you dismount the seat you could put a platform on top. Unlike a two-wheeled trailer, you'd have to be fairly careful about balancing the load.

Or, if you wanted to build a two-wheel trailer, this certainly gives you a preconstructed mechanism for coupling the trailer to the bike, which is one of the tricker design points.

As always, I think this boils down to how good you are at designing around what you have. Look at other trailer designs, see what parts of them this could replace or what parts of this could be replaced by something to make it more like them...

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user

I want to carry one of those non-motorized push lawn mowers. I'm without a car but I want to be able to mow lawns around my neighborhood. I'm concerned that that's too big for the Hitchhiker frame. I'll look into it tho. It's good to have the trailer hitch, if nothing else.

Thanks for the advice!

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user

That's a fairly heavy and hard-to-balance load. If you can figure out how to hang it LOW, and how to strap it solidly in place so it can't move unexpectedly, you might get away with it. Otherwise I'd suggest that you need something with two wheels for stability.

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user
seandogue (author)2011-03-18

I'd go one step further than Ork and say emphatically yes, although you'd probably want to strip the power train and keep your final load (including any additional hardware and casing to the weight limit of the hitchkiker gizmo.

To me, it looks like the seat tube and handle bar mount would be good pooints at which to afix the carrier basketing.

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user

I want to carry one of those non-motorized push lawn mowers. I'm without a car but I want to be able to mow lawns around my neighborhood. I'm concerned that that's too big for the Hitchhiker frame. I'll look into it tho. It's good to have the trailer hitch, if nothing else.

Thanks for the advice!

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user

Well, you could always build a carrier for the mower onto the hitchhiker frame you show in the photo. That's basically what I meant by "basketing."

A manual push mower weighs about 40 or 50 lbs if I recall correctly, which should be fine, as long as you secure the mower-mounting jig well.

When I was a kid, I mowed lawns exclusively with a manual (no motor) push mower and I used to pull the mower behind me on my bike with the mower running in freewheel (reverse). There was no "carrying" involved, since it rolled. In forward, the wheels engage the cutting mechanism, but in reverse only the wheels turn.

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