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We just made a longtail cargo bicycle from a second-hand Ukrainian mountain bike. It was made in Haiti with a minimum amount of tools and measuring, but it rides well. This bike has carried three adults (400 pounds total) without catastrophic failure. It is currently being tested/abused by the teenager pictured.

Step 1: Find a bike

Picture of Find a bike
Find a bicycle for as cheap as possible then cut the seat-stays about here, and the chain-stays just behind the bottom bracket.
 
kermitg made it!6 months ago

Having done this my self I would recommend extending the seat stays and chain stays, as with this method you can use thinner tubing and avoid welding on the seat tube, which if a melt through occurs will cause problems fitting the saddle.

I used this (above) method, inserting thicker tubes, and it works fine. I enjoying riding the bikes and it a very useful thing to have.

If you would like to read about my experience then Google:

"dorky thorpy longtail cargo bike"

long_tail_cargo_bike_35 (2).jpg
Hey, thanks for the design!

I want to pick your brain a little bit--I pretty much need this bike, plus platforms and a heavy-duty kickstand so it won't be exactly the same...

First, do you have any concept of how much extra weight this put on the bike? i.e. are we talking five pounds or fifteen?

Second, have you tried making a sturdy kickstand for it? and if you have, what are the chances of you putting THOSE plans up too?

Thanks again :-)
depp.ben (author)  MountainMommaC3 years ago
Hi, I didn't add a kickstand. I don't have this bike anymore so I can't weigh the bike but I'm guessing this modification added 10 pounds to the bike. Goodluck.
harknirf5 years ago
 just built a bike like this based on this instructable, even used the same welding machine.  turned out great!  Thanks for the write-up/inspiration.
depp.ben (author)  harknirf5 years ago
That's awesome, I'm happy to hear it.
Don't let that 'chicken' into my coop! The cox comb doesn't fool me: the beak and head belong to a raptor. A great bike!
milly03455 years ago
cover those legs and arms not only against the sparks.I have the scars to prove that but the UV light  and use a mask
i was reading about a guy who was restoring his car and used a welder for prolonged periods (a few minutes at a time within like a few hours) he ended with a tan with tan lines the size of his goggles!
chadeau5 years ago
He said 'hole' ! lol
Koosie5 years ago
Awesome, that's like a pick-up-bike!
gmoon5 years ago
Great build--nice chickenhead welding mask, too.