SMART Tire company and NASA teamed up to launch an airless tire made of a nickel-titanium alloy also known as smart memory alloy. It is unlike the airless tires currently under development by Michelin and Bridgestone, which are made of rubber.
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The METL is expected to be available to the public in 2022.
![](https://i.ytimg.com/vi/z-86241scNI/maxresdefault.jpg)