Variable Frame Bike

The bike is up, then the bike is down. You sit on the bike upright in the city, then set it down to cruise in the suburbs. It’s intuitive. It’s wild. It’s a thesis project. It’s got a video to go with it. It’s already mocked up. The final version will have a battery and hubmotor for a little kick in the pants. Environmentally friendly city and country transportation in one bike.

Each frame is adjusted to the weight of the rider. The rider may ride in either mode forever, but if the rider wants to switch from one position to another, they’ve just to push the locking lever and lean forward or backward. The rider may change positions while continuing to ride the bike.

Info on the mockup movie, below:

This is the proof of concept mockup for a commuter bike with variable frame as part of the diploma thesis of the product-designers daniel knüpfer and stefan wallmann at anhalt university, dessau in mai 2008. In the concept, the frame can be locked by a lever on the handlebar, that feature is missing in the mockup. Also, the springs that help bringing the rider in an upright position need to be adjusted to the riders weight to balance the frame (making it possible to switch positions while leaning back or forth). these springs are too weak in this prototype, therefore the riders in the video need to push the backrest a little bit. only a very lightweight rider managed to bring himself up by simply leaning forward.

Vielen Dank, Deutschland.

Designers: Daniel Knuepfer & Stefan Wallmann


  • Kelly Hayden says:

    I love the idea. It seems obvious that different types of bikes have different advantages so why not combine them? The transition seems amazingly smooth. Is there a way to lock it in one position say for when you’re really pumping uphill and pulling back on the handlebars hard? Because it seems a bit unstable when riding normally. Also the concept frame shape seems awkward and semi-random but I can also see the need for the structural support. Very original and ambitious! Good luck!

  • Lamah says:

    It looks awesome! Total respect for actually building a working prototype!

    • designcomps says:

      yes massive respect for proving it works. so many chumps on this site think the idea alone is it. note to all wannabe designers out there, 1% inspiration. 99% perspiration..

  • First off a big gold star for building a working prototype! Proto’s are hard, but you learn so much from them and show commitment (or lead to you being committed). I do see where weight is going to be a problem, and there is the issue of market acceptance but in the end you followed your idea to the very end and that shows a lot more than some pretty computer drawings in my book.

  • Jeesee says:

    Sorry, but the mock up is more fun to look at,
    than the final design

  • Jeremiah says:

    Freaking EPIC! O_o

    I also commend thee for for such a grand prototype. I dub thee, with all the awsomeness of the universe, devine thinkers. Keep up the great work, and please do your best to get this idea on the market! Because no matter the cost, I’ll be waiting. This actually just made me smile a bit, probably even made my day. 🙂

  • Michman says:

    Great design.

    And the fact that you have a prototype made is great for proof of concept.

  • dr.Lojz says:

    I am riding recumbert my self, but this is GALACTIC!
    Good work done guys!

  • MadCow says:

    all around awesome work guys. the down position looks a little uncomfortable and hard to steer/handle, but im sure it can be adjusted.

    i would love one of these things and just pimp it out and cruise…

  • Anurag Sarda says:

    The design is too good! Th best part is the flexibility of recumbent to a regular position….

  • Anurag Sarda says:

    The design is too good! Th best part is the flexibility of recumbent to a regular position..

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