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One-Wheeled Wonder

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Barring the odd three-wheeler, most wheeled vehicles throughout history have sported an even number of wheels, usually four. But that doesn't seem streamlined enough for certain aesthetics. This trope describes creatures (usually robots or cyborgs) or vehicles that move by balancing on a single wheel, or occasionally a spherical ball.

Try not to think too hard about how it stays upright.

Truth in Television insofar as the unicycle has been in use since at least the late 19th century, when riders of penny-farthings found that they could lean forward, raising the much smaller rear wheel off the ground, and still maintain balance. Eventually the rear wheel was left off of the design altogether, resulting in the modern unicycle. However, it has largely been regarded as a gimmick since the development of the safety bicycle (what most people think of simply as a "bicycle").

Monowheel Mayhem is a subtrope in which a vehicle is a single wheel. Non-robotic creatures to which this trope applies are examples of Bizarre Alien Locomotion.



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    Anime & Manga 
  • Venus Wars features a violent sport called Battle Biking, which is kind of like roller derby fought on one-wheeled monobikes. The heroes of the manga and anime, the Killer Commandos team, use their bikes in their first guerilla action against the Ishtar invaders.
  • Dragon Ball: Launch is shown riding a one-wheeled bike when she robs a train in her introductory episode.
  • Ricardo Fellini in Gundam Build Fighters occasionally uses a support unit called the Meteor Hopper, a one-wheeled motorcycle for his Wing Gundam Fenice. He eventually stops using it after upgrading his Gundam to transform.

    Films — Animation 
  • Bigweld in Robots rides on one giant ball, which makes up most of his body.
  • A little hard to see, but M-O from WALL•E runs around on a motorized ball.
  • Poet Anderson: The Dream Walker and its prequel comics features plenty of one-wheeled hoverbikes, mostly used by non-evil characters.
  • Officer Shrift from the animated adaptation of The Phantom Tollbooth gets around on a wheel that resembles that of a rolling chair, connected to something that looks like a car jack that can be raised to compensate for his height. It's unclear whether this is a vehicle that he is seated on under his long jacket or a part of him or what.
  • The Lorax: Ted's scooter has only one wheel, looking like a big ball. This doesn't stop him from doing impressive stunts with it.

    Films — Live-Action 
  • Star Wars:
    • The droid waitress WA-7 in Dexter's Diner on Coruscant from Attack of the Clones serves customers while balanced upon a single wheel.
    • BB-8 from The Force Awakens is a little droid that rolls around on a ball. This was a practical effect and not CGI.
  • One of the bikes in the Mega Race during Spy Kids 3: Game Over is a motorized unicycle with a very high seat.
  • Alita: Battle Angel: Hugo uses a monowheeled motorcycle to move around Iron City, and frequently gives rides to Alita.

  • Ciaphas Cain: One of the techpriests in Emperor's Finest and Caves of Ice had his lower body replaced with a single wheel. Made even worse by the fact that techpriests have huge metal dendrites attached to their backs and like to replace as much of their body with metal as possible, though Ciaphas mentions that he must have very good gyroscopes to work.
  • The Mulefa in the third book of Phil Pullman's His Dark Materials trilogy. They're a race of Starfish Aliens who use a giant round seed as a wheel, and attach it to their two middle feet.
  • Groomatron from House Of Robots Robot Revolution is drawn as using a single wheel for mobility.
  • Piers Anthony's Cluster Series has several unusual alien physiologies. One of them is the Polarian — a race that travels and balances on a big ball — which makes it a bit easier on the creatures than the usual one-wheel design.
  • One of the road-gang in The Last Continent rides a huge wheel with a saddle on top, pulled by an emu.

    Live-Action TV 

    Tabletop Games 
  • A citizen in the BattleTech universe can purchase the DB-6000 Defiance Bluestreak racing-style monocycle, which runs on a hydrogen fuel cell.
  • The Castle Falkenstein supplement Steam Age throws in steam-powered personal unicycles. Because why not?
  • In the Warhammer 40,000 Gaiden Game Gorkamorka, one of the Kustom Leg Replacements that an Ork can randomly acquire from a visit to the Doc's Serjery is the Gyro-Stabilised Monowheel. This crude prosthetic consists of a single wheel attached to an engine that replaces the Ork's legs. A model with a Monowheel increases their Movement stat but is unable to move through difficult terrain, board vehicles or climb walls.

    Video Games 
  • Claptrap from the Borderlands series is a roughly half-human-height robot that gets around this way.
  • Some of Dr. Robotnik's robots from the Sonic the Hedgehog video game series are like this. The earliest (and probably most notable) example is Motobug from Sonic the Hedgehog.
  • The Securitron robots, which form the personal guard of the post-apocalyptic mogul Mr. House from Fallout: New Vegas, look like this.
  • Robot Medics in Team Fortress 2 are the only robots in the game to not use legs, instead opting for a single wheel.
  • Mega Man
  • Mighty No. 9's Round Digger and Round Borer have spherical bodies with a separately moving belt around its centreline that it uses as a wheel.
  • The helper Wheelie from Kirby Super Star. You can ride onto it and become the Wheelie Rider.
    • Taken even further with the other Wheelies from Kirby Air Ride, with Wheelie bike, Wheelie Scooter and Rex Wheelie.
  • The Type-9 Surveillance Robots Machine Hunter. It's fast and comes with a built-in rocket launcher. It's a headache if it's an enemy, until you disable it and take over it's circuits thanks to your Machine Hunter powers.
  • Skylanders has two: The legendary Giant Bouncer and the Swap Force entrant Magna Charge.
  • Maestro in Mystery Mountain. He is the only android designed this way; Mrs. Beasley and Eggbert hover and the rest are bipedal.
  • Roadkill Rodney, a robotic enemy from the arcade game Teenage Mutant Ninja Turtles and its ports. Not only could it stay upright on one wheel, but it could send out an electric cable to try to zap a turtle. Whether or not it succeeded, it never fell over until it was defeated.
  • The obscure video game MoHo had gladiatorial robots with a single ball on which they moved.
  • The Stillborn Franchise Defenders of Dynatron City included Buzzsaw Girl, a mutant heroine whose lower body was a buzzsaw that functioned as a wheel.
  • In the Super Famicom Product as Superhero game UFO Kamen Yakisoban: Kettler no Kuroi Inbou, riding the Yakisoban Unicycle (a non-action toy in the commercials) provides Temporary Invincibility.
  • Star Wars Droidworks has several locomotion options for wheeled droids, including one that's a non-magnetic unicycle, which is useful for avoiding being caught by electromagnets, and another as a streamlined tricycle.
  • The clown of Kick Man rides on a unicycle.
  • Mettaton's standard form in Undertale is a rectangular body balancing on a single comically tiny wheel.
  • The protagonist of Pokémon Colosseum travels around Orre in a motorcycle that has one wheel in the back, plus a sidecar with...some kind of...hover-thing. Good luck figuring out how this thing works.
  • Wildstar has the Grinder mounts and the Uniblades, preferred by the Exiles and Dominion respectively. They are interesting both in the fact that while they have one wheel, the rider's placement varies. With Grinders, they sit on a support out in front of it, while the Uniblades have the riders on a strut behind the wheel. Also, both technically could be considered cheating; they use antigravity to keep stable and prevent themselves from tipping.
  • The Octo Samurai from Splatoon 2 moves about the arena by riding on a comically small unicycle. He can make something more practical by combining it with his oversized ink roller, however.
  • The eponymous protagonist of Rocket: Robot on Wheels for the Nintendo 64.
  • The system-repair drones from FTL: Faster Than Light move around on a single wheel. Anti-personnel and boarding drones, by contrast, move on twin treads, giving them a more intimidating design.
  • In Tiny Toon Adventures: Buster's Hidden Treasure, the robot enemies in the factory levels stand on one wheel.

    Web Comics 

    Web Original 
  • The robot mascot for the website/image search engine TinEye is a one-wheeler. Also a case of Invisible Anatomy, since that wheel is not visibly linked to the rest.

    Western Animation 

    Real Life 
  • The unicycle, of course.
  • Behold, the Honda UNI-CUB.
  • A self-propelled unicycle has been developed. Like a Segway, all the rider need do is lean forward. The unicycle more or less self-balances.
  • The Uno-Wheel Motorcycle, the first fully functional one wheeled-motorcycle. Though technically it has two wheels side-by-side, it looks quite close to Code Lyoko's Overbike.
  • Along the lines of the Polarian mentioned under Literature the Ballbot is a robot that balances and moves on a single ball.
  • The BB-8 droid from The Force Awakens is a practical effect, meaning that such a robot actually does exist in real life. You can even buy your own smaller licensed version.


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