Michelin's Airless Tire
 

Named the Tweel, Michelin's invention in an all-in-one wheel and tire: deforming resin spokes provide the give that air would've previously, and an outer tread gives the same grip as rubber. The benefits are pretty obvious: no air means no pesky punctures, and the slight deformity means the wheel rolls over bumps more smoothly.

http://i.kinja-img.com/gawker-media/...njnjcylvf9.jpg

VIDEO:

Now Bridgestone has one:

http://www.speednik.com/files/2015/0...-2-640x427.jpg

That's actually pretty cool technology, that'd be great for off-roading (or on roading for that matter).