From the Wikipedia article:
“In the California desert, a tire comes to life and embarks on a killing spree as an audience watches the events unfold through binoculars. The tire kills by vibrating intensely and psycho-kinetically causing people’s heads to explode.”
To be honest, this sounds like one of those concepts that sounds great on paper, but doesn’t really translate into an engaging feature length film. But I could be wrong! And the posters certanly are something.