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Airless tires, non-pneumatic tires (NPT), or flat-free tires are tires that are not supported by air pressure. [1] [2] [3] They can be used on small vehicles such as ride-on lawn mowers and motorized golf carts. They also are used on heavy equipment required to operate on sites where risk of tire punctures is high.
The Tweel airless tire design. The Tweel (a portmanteau of tire and wheel) is an airless tire design developed by the French tire company Michelin.Its significant advantage over pneumatic tires is that the Tweel does not use a bladder full of compressed air, and therefore cannot burst, leak pressure, or become flat.
The reason regular tires have treads is to avoid hydroplaning when the surface of the road is wet. Therefore racing cars competing in dry conditions characteristically use tires without treads, often known as slicks. For example stock cars driven on professionally maintained NASCAR tracks use tires without treads, and with a thicker layer of ...
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The small footprint of the bar grip tread makes them perform poorly on sand. Even in the 1930s, 'balloon' tyres with wider treads, smaller tread patterns and lower pressures, were available for desert use. [5] [6] The poor water clearance of bar grips may limit their performance on very wet mud.
The tundra-style tire has been independently invented at different times and places. In North America its post-World War II invention is credited to Canadian Welland Phipps, [1] potentially inspired by the Goodyear Tire & Rubber Company's pre-World War II development of their own, similar low-pressure "airwheel" as a complete wheel-rim and tire set — said to be of the "Musselman" type from U ...
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