Dicycle Build Plans


A reinvented classic, where you drive from inside the enormous wheels!   More info...




The Baum Dicycle (BDC) is a new twist on a rather old-fashioned machine. We've all seen the crazy Monowheels where the rider drives the machine from inside a single hoop. These machines, although very cool, are also very unstable. The BDC puts two large hoops side by side (making it a Dicycle) for greater stability, and better steering. The BDC features two mammoth 6 foot diameter wheels. The wheels are controlled by skid steering, facilitated by a differential axle. The rider can do a pivot turn (similar to the PTV and Magic Carpet), and steer with ease. The BDC is made from CNC cut sheet metal using a unique self-fixturing tab-in-slot design. All flat steel - there are no requirements for either sheet metal bends or tubing bends. You can build it yourself using my build plans if you have a welder, and just a few other basic tools. When you buy the plans, you get the flat patterns to waterjet, plasma cut, or laser cut your own parts. The BDC features an adjustable seat position, an adjustable and extendable handlebar, and a cup holder. The BDC costs around $2300 to build. See the slideshow and the official demonstration video.


  • Drive from inside the massive 6-ft-diameter wheels!
  • Designed for street use, where legal. Please be safe!
  • Welding required to build.
  • Difficulty: Medium-Advanced


  • Ground Clearance: 10 in
  • Height: 73 in
  • Length: 73 in
  • Propulsion: 6.5-hp gasoline engine with CVT transmission
  • Top Speed: 20 mph
  • Turning Radius: 3 ft
  • Weight: 475 lbs
  • Width: 30 in

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