Picture of Duck tape two-person bicycle
How to make a two person "tandem" bicycle using nothing but two dead ordinary bikes, two sticks and a roll of duck tape!

Step 1: Our target

Picture of Our target
This is what we'd like to build - twice the power, twice the danger, twice the fun!
pcanywii2 years ago
its not really DUCK TAPE. it just INCLUDES duck tape
warlord8 years ago
If you throw a few pipe clamps (worm gear clamps) on there before you start duct taping you could get a little more structural integrety. Hopefully it would keep you from having a catastrophic failure at some point while riding the bike. If you wanted it to last a long time just ride it to a muffler shop. I'm sure they'd weld it together for you for a small fee. Probably $20...
Really, you could just ask them?
I'm sure they would: extra cash for them after all. Years ago I needed a 2m length of steel pipe welded to the back of an axe head (as a hole digger for around roots, etc), so just walked up to the local motor mower repair shop who did it for me on the spot (might have done it free too - I can't remember).
otaku118 years ago
their not called "gear changers" their called deralleurs.
Thank you, captain obvious =)
youre welcome lieutenant sarcastic jk :)
Its not spelled "their", its spelled "they're". Its also not spelled "deralleurs", its spelled "derailleurs". Thank you for comments that add sooooo much.
Chillax, it is only a comment, he was trying to help and you have to put him down, not cool
A correction should simply be correct...
yes, but it doesn't have to put people down, a better way of wording this would be, "Very nice comment, but you did spell derailleurs wrong and "they're" would be more appropriate than "their", it is a good comment though", that would be a polite way to correct him.
Very nice comment, but may I suggest you go back and read the snippy original comment to which I replied? It was not necessary or constructive. Arrogance begets arrogance. Thank you again for your nice comments and valuable life lessons.
Very true, you win.
shammallamaman, you win the sincerity star, and romedeiros1970 gets a cross for services to sarcasm. Both are valuable ingredients on the internet :-)
i agree
I think sweavo is the smartest one in this debate
One thing that turns off an educated person on forums like this is the widespread illiteracy. And most of the illiterates I've seen are actually PROUD of it and think it makes them look cool and colorful.
nikkners apop517 years ago
Relax, mellow out man. Educated or not there are a abundance of other significant topics than this tandem bike post to be a literacy bigot about. Inclusively, this site of forums is for inventions explained in layman terms for the common man. This is not a site of professionalism. So deal with it or make a site that suits to your liking. You are going to have to face the fact that your comment is not going to make a dent; especially when you are dealing with cool and colorful people. Usually they are the kind of people that are not straight arrow minded as you want them to be. For the fact of all involving matters, this is how ideas and inventions evolve. The widespread illiteracy just simply proves that their minds are focused on other things than literary values. And this is coming from a girl that English is her second language.
Amir6 years ago
Hey bro, I think you're bike is super awesome. I've got one that I've started working on in the garage that's been sitting for at least 2 months. It's one of my first welding projects. Your super awesome bike makes me want to go finish mine. Thanks for the instructable, and the motivation.
Amir Amir6 years ago
I'm sorry, that's "your" bike is super awesome*.
Geordiepom7 years ago
Two apprentice welders I know ended up in hospital (1 broken collarbone, 1 concussion) after a homemade tandem fell apart on them. I can't wait to tell them they should have used duck tape instead of welding it.
check out my idea after I've finished updating!


I'm using a rear axle through a front hub, bolting the things together, and basically riveting the headtube of the stoker's bike. too easy.
hunter_957 years ago
did you just put duck tape on the bike
mrxoliver8 years ago
piropos9 years ago
I've been looking all over the internet for a homemade bike tandem and this is the best and most doable I've seen so far.
Prometheus9 years ago
If you had just used right-hand cranks on the left side, you could have used all the gears on the bike instead of having to sacrifice your two-smallest chainrings to transfer the power from captain to stoke5r (front-to-back for all you non-cyclists out there :P) I agree, the ping-pong table is classy too lol...
markocosic (author)  Prometheus9 years ago
Agreed - though purchasing another right-hand crank would go against the whole two bikes and a roll of gaffer tape theme. ;-) In San Francisco you may want the two smaller chainrings but elsewhere it's not been too much of an issue
trebuchet039 years ago
Hole !@#$ !!! The stoker probably would like handlebars (to get more power to the wheels)... but man, something in the back of my head says not to take that on the road while another part tells me wooo fun! Duck Tape: By Engineers... For Engineers... --- How is it to ride and how long have you been riding it? Curious to how the tape holds up :P
darn.... I should have said how long (as in distance) :P
markocosic (author)  trebuchet039 years ago
Distance wise it's around a mile from the house to lectures, maybe 1/2 mile between lectures and a mile back 5 days a week then either nothing or lots on a weekend - say 2.5 miles/weekend average to give 15 miles/week. Riding wise the (rake?) angle for the front forks is "wrong" compared to an ordinary bike so the steering is slightly twitchier than usual. Brakes are shocking inadequate (cheap pads will smoke, melt and fall off if you try a stop from 30mph with two people on, with decent pads its ok but takes foreverto come to a stop). If the person up front really starts putting some power down the frame will flex towards the cahin side and you'll have to correct with the steering. The rear pedals are low and you have to watch dropping the bike up and down curbs and leaning it around tight corners. Essentially its bloody awful to ride and fairly dangerous - but somehow its so bad that its amusing and it seems to hold together fine! :-)
A Playboy beer pong table on cinder blocks... classy.
kenneth12479 years ago
This is awesome! Seems like it might be a bit unsafe, but it sure sounds like fun.