Clip-on tire spikes for winter driving. I will be the first to proclaim "gimmicky", but, in this case, I'm also skeptical of my skepticism. These look largely like tire chains, but perhaps easier to install. They have a variety of models with different attachment methods.
2:43 video:
More: Spikes-Spider: Easier, Better than Tire Chains - Winter Driving
Previously:
Estonian ice road and resonance wave destruction - video and photo
NASA Tire Assault Vehicle (TAV), made from a German World War II tank model
Tire doubling machine - GIF
RingMaster large tire changer
Removing bead wire from tire - GIF
Machine for installing tires on rims - GIF
Formula One tire warmers - GIF and photo
Changing tire while driving - GIF
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