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Picture of Build A Massive Snowmobile Tank Bike
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After getting inspired by the final episode of American Choppers and then seeing my neighbors driving around on their snowmobiles, I set out to make a crazy combination of the two as a pedal-powered monstrosity.  I designed and constructed this bike in just under three weeks using three broken bikes, some steel tubing and angle iron, and an old 1990 Polaris snowmobile track. 

It’s a fun challenge recycling old bike parts and converting them into a new bike, and this massive, 7 foot long bike provided some unique challenges.  Integrating the tread with the bike frames and turning through a big track on a heavy bike that doesn’t allow for traditional high-speed steering is definitely an adventure.   

A MIG welder and a regular hacksaw served as the primary tools for construction, in addition to a common set of wrenches and screwdrivers.  This is definitely a great project for diy bike or snowmobile enthusiasts with some junk bikes, scrap material, and free time.
 
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Step 1: Planning the Internal Frame

Picture of Planning the Internal Frame
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After getting all the necessary tools, parts and as many bikes as possible, start by planning out how to integrate the snowmobile track with the bike frames.  Children’s mountain bikes with 20” tires fit nicely inside of the track, and the knobby mountain bike tires fit snugly in the gap where the sprockets are supposed to fit.  I found that the limited space inside of the tread accommodated a three wheel configuration more easily than all four wheels.  

Start by disassembling the two bikes for the interior assembly down to just the frame with the pedals.  Cut down the frames so that they fit inside the track with enough clearance for it to rotate.  The frames will be kept parallel with the addition of the third wheel between them in the back. Center the third wheel down the middle of the track by welding the seat and chain stays from an additional bike frame to the inside of the other bike frames, giving another set of dropouts where the wheel could conveniently be attached.  When welding to the bike frames, make sure to sand or grind all of the paint off of the surface of the metal.  The dropouts on the third wheel also make it easier to remove the tread by just taking off that third wheel first.  *Be sure to dimension the assembly so that the track is snug with deflated tires so that once you inflate the wheels, the track will be tight without having any other mechanism to tension it.
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BikeHacker1 year ago

You could add a ski to the fork.

thrawn12 years ago
On the epic scale, this is pretty damn high! How much did it end up weighing? Having made 3 bikes myself I can appreciate some of the issues that arise from having donor bikes that don't quite match, well done.
jsmith259 (author)  thrawn12 years ago
Thanks so much! Not quite sure how to weigh it effectively, but you don't want to be carrying it too far! Yeah, it's definitely a fun challenge converting old bikes into new ones.
Mikey2.02 years ago
I'm sure you could put snowmobile ski on the front and actually ride it in deep snow. Hows the turning radius?
jsmith259 (author)  Mikey2.02 years ago
I'll have to try it next winter! The wheel's nice for right now because it still runs on the sidewalk or in mud, but I like the idea of making it more of a true snowmobile.
curtman292 years ago
Very cool! I would wanna have half the track for weight reasons. Then you could turn alot easier also. But still a very cool design!
jsmith259 (author)  curtman292 years ago
Thanks! It's definitely very heavy and very difficult to turn, a half-track would be an interesting improvement!
I want to make a snowmobile type bike like that! You guys should make a video tutorial on how to make this.
jsmith259 (author)  skidoooutlet2 years ago
I would recommend it, it was a lot of fun to build. I'll try to put together a tutorial as well.
FoamboardRC2 years ago
OMGosh that is so cool! Gave you a vote! Ure soo gonna win!
jsmith259 (author)  FoamboardRC2 years ago
Thanks so much, I really appreciate it!
mysss2 years ago
This looks like an awesome achievement. It seems like it would work a lot better as a recumbent...which might be more chopper-y, I'm not sure about that part. It looks like it sort of would work with the ultra-low-seat style of pedaling most people seem to use; but I'm pretty sure it'd be a lot more comfortable and efficient if you used a "proper" pedaling style with your legs extending roughly all the way...with a giant snowmobile tread to turn, I'd want all the help I could get!
jsmith259 (author)  mysss2 years ago
Thanks, definitely worth looking into. We just arbitrarily mounted the seat in a location that was convenient to put it where we could still reach the pedals, but I'm considering moving it. I like the idea of a recumbent.
Gaark2 years ago
Totally hard case!! Love it!!
jsmith259 (author)  Gaark2 years ago
Thanks!
MCUman2 years ago
From the pictures, the little angle piece joing the pedal cranks is absorbing all of the lateral stresses. You might consider adding a couple of cross-frame members to stiffen the carraige. Interesting concept. Well Done.
jsmith259 (author)  MCUman2 years ago
Good call. The addition of the third wheel between the two frames took away some of the stress, but we did need to weld another bar between the frames afterward, it's tough to tell in the photo though
jcarlyle12 years ago
That is the coolest thing I have ever seen!!! but I bet those handle bars don't do too much, do you have to get off to turn a corner? Would be worth it anyways i bet.

+1 for video!
jsmith259 (author)  jcarlyle12 years ago
Thanks! Definitely very difficult to get used to turning, eventually can get some wide turns, still a work in progress though!
http://www.youtube.com/watch?v=hlgdL-Z0rHc

(snowmobile bike appears towards the end)
voyageur102 years ago
This is awesome! A full video of the bike in action would be EPIC! Thanks.
jsmith259 (author)  voyageur102 years ago
Thanks so much! Working on it!
Machshop2 years ago
Awesome and original design/build! Kudos for the out-of-the-box thinking that created a so NOT so out-of-the-box result! Add me to the video request list!
jsmith259 (author)  Machshop2 years ago
Thanks so much! Working on it!
husamwadi2 years ago
ride thru the drive through like "waddup I got a snowmobile tank bike"... LOL AWESOME.

It's different, have you tried no hands? can you pop a wheelie, if you could pop a wheelie that'd make you an insta boss!
jsmith259 (author)  husamwadi2 years ago
I like the sound of that! If I can pull that one off, I'll be sure to get a video for you
I wonder how this actually performs in mixed weather/ice without snow. Chicago may be forced to witness this beautiful franken bike
jsmith259 (author)  veryrealperson2 years ago
Couldn't quite get it all together while there was still snow on the ground! Working on getting it all ready for next winter!
Eunix2 years ago
Congratulations on winning the bike contest, this IS a great instructable.
jsmith259 (author)  Eunix2 years ago
Thanks!
husamwadi2 years ago
congrats on the GRAND PRIZE!!!!

now you can fix dat monster bike with your new toolset!
jsmith259 (author)  husamwadi2 years ago
Thanks! For sure, still got a lot of fine-tuning to do haha, the tools will definitely help!
bajablue2 years ago
Woo HOO, jsmith!!!
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jsmith259 (author)  bajablue2 years ago
Thanks so much!
jsmith259 (author) 2 years ago
Hey guys, big thanks to everyone who voted for the bike and helped me out in the contest!!! Thanks for all of the comments too, I appreciate the feedback! I'm working on some adjustments now, I'll definitely work on putting up a detailed video of the bike soon as well.
srilyk2 years ago
I want to see a video!
agm882 years ago
thumbs up man!!!!!!!!!
neil17012 years ago
Mega and more stable than sliding down a slope on the snow with a ski attached to the bottom of a front fork,wobbling about all over the place,much more stable this is it be,may the force of awesome creativeness be with you,always.
Kiteman2 years ago
O M G ...

Please tell us there's video?
http://www.youtube.com/watch?v=hlgdL-Z0rHc

(snowmobile bike appears towards the end)
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