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What makes a wheel design “weird”?
A conventional wheel rolls along the plane of its rotation. Unusual designs change either how the wheel makes contact with the ground, how it is supported and driven, or the directions in which it can move. That can make a mechanism useful for a robot, conveyor or rover without making it a practical replacement for a car wheel.
The examples below have different evidence behind them: commercial product descriptions, a historical technical report, a patent publication, a manufacturer’s concept vehicle, and NASA’s accounts of rover technology. None of the cited sources provides a common test comparing cost, traction, efficiency, durability or safety, so they do not establish which design is best.
What are omni wheels, and can a wheel move sideways?
An omnidirectional wheel combines its main rotation with another rolling action. In a common design, small rollers are mounted around the main wheel’s rim. The wheel rolls in its usual direction, while the smaller rollers can turn to let a robot or conveyor move laterally. The added motion is useful in confined spaces, but it depends on the specific mechanism.
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Rollers around the rim
Omnia Wheel describes omni wheels for robotic mobility and conveying, making these a concrete example of the design category in commercial use. That is the manufacturer’s description of its applications; it is not evidence that omni wheels are suitable replacements for road-car tires. See Omnia Wheel’s product information.
A segmented-rim alternative
Not every omnidirectional mechanism uses the same small-roller arrangement. A U.S. National Technical Information Service record describes a 1974 report by NASA Marshall Space Flight Center on a segmented-rim wheel whose elements can drive movement perpendicular to the wheel’s normal plane. The record establishes the report and its described mechanism, not present-day commercial availability. View the NTIS report record.
For historical context, robotics researcher Raul Rojas’s account identifies J. Grabowiecki’s 1919 patent as the earliest omnidirectional wheel and places Bengt Ilon’s modern design around 1973. Those dates are Rojas’s historical account, rather than an independently verified patent chronology. Read Rojas’s history of omnidirectional wheels.
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How do spherical wheels work?
A spherical wheel can offer contact in multiple directions, but a sphere still needs a mechanism to support and drive it. Two designs in the sources illustrate different approaches; neither should be mistaken for a conventional automotive wheel.
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Patent publication WO2021102556A1 describes an omnidirectional assembly with a spherical body formed from two hemispherical members. A hub and drive roller support and drive the assembly, while the hemispherical parts rotate around different axes. The patent discloses a design; it does not establish that the mechanism is sold as a product or used on road cars. Read the WIPO patent publication.
Hankook’s robotic wheel and concept vehicle
Hankook presents WheelBot2 as a robotic wheel with spherical tires designed for motion in multiple directions. Its PathCruizer vehicle is identified as a concept model, not a production car. This is a manufacturer’s description of its innovation work, not a comparative performance test. See Hankook’s WheelBot2 description.
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Why are some wheels hubless?
A hubless or centreless wheel makes its support structure part of the visual spectacle: the center is open, so the wheel can appear to float around the vehicle structure. Mechanically, the design must support and drive the wheel at or around its rim instead of relying on a conventional central hub.
The patent source describes a spherical body within an envelope and a drive roller, but a patent is evidence of a disclosed invention—not proof of a commercially available, road-certified vehicle. The cited sources do not establish service life, braking performance, cost or road certification for hubless designs, so the striking appearance alone cannot tell a driver whether one would be practical on the road.
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What wheels do lunar rovers use?
On rough planetary terrain, a wheel may need to handle ground unlike a paved road. NASA describes Lunokhod as using eight rigid wire-mesh wheels with bicycle-type spokes and metal cleats. These are purpose-built rover wheels, not ordinary tires with a futuristic tread pattern.
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NASA also describes the Spring Tire, developed in the mid-2000s by NASA Glenn engineer Vivake Asnani with Goodyear. It used hundreds of coiled steel wires woven into a flexible mesh, intended to support a load while conforming to terrain. NASA’s feature documents the design and development history; it does not establish the Spring Tire’s current deployment. Read NASA’s feature on reinventing the wheel.
How these unusual wheels differ
| Design | How it moves or is supported | Intended setting | Evidence described here |
|---|---|---|---|
| Roller-equipped omni wheel | Main wheel rolls normally; rim rollers allow lateral motion | Robotic mobility and conveying | Manufacturer product description |
| Segmented-rim omnidirectional wheel | Rim elements can drive movement perpendicular to the wheel’s normal plane | Mechanism described in a technical report | 1974 NASA Marshall report record at NTIS |
| Spherical assembly | Two hemispherical members rotate around different axes, supported and driven by a hub and roller | Omnidirectional mechanism | Patent publication |
| WheelBot2 and PathCruizer | Spherical robotic tires are described as enabling motion in multiple directions | Robotics and a concept vehicle | Manufacturer innovation description; PathCruizer is a concept model |
| Lunokhod wheels | Rigid wire mesh, bicycle-type spokes and metal cleats | Lunar rover terrain | NASA historical feature |
| Spring Tire | Coiled steel wires woven into flexible mesh | Rough-terrain wheel development | NASA account of mid-2000s development with Goodyear |
The table compares the mechanisms and the kinds of evidence available, not their performance. The sources do not supply a shared test protocol or comparable figures for load, speed, efficiency, traction, durability or safety.
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