Divergent is a 2014 American science fiction action film directed by Neil Burger, based on the novel of the same name by Veronica Roth. The film is the first installment in The Divergent Series and was produced by Lucy Fisher, Pouya Shabazian, and Douglas Wick, with a screenplay by Evan Daugherty and Vanessa Taylor.
The use of whitewall rubber for wheels has been traced to a small tire company in Chicago called Vogue Tyre and Rubber Co that made them for their horse and chauffeur drawn carriages in 1914. Early automobile tires were made of pure natural rubber with various chemicals mixed into the tread compounds to make them wear better.
Tire bead is the term for the edge of a tire that sits on the wheel. Wheels for automobiles, bicycles, etc. are made with a small slot or groove into which the tire bead sits. When the tire is properly inflated the air pressure within the tire keeps the bead in this groove. It is common amongst drivers of off-road vehicles to decrease the air pressure in their tires.