Usually the half-axle is broadened into a V with front and rear pivots to keep it from twisting. Pivots allow the bar to twist, but to a limited degree so that rolling is controlled.
Today, the Ford Taurus SEL — the top-of-the-line before you get into the high-performance SHO — comes standard with 18 inch wheels. Many buyers select the optional 19-inch wheels, though, which come with Goodyear Eagle RSA 255/45R19 tires. The alpha-numeric soup on the sidewall might not instantly make sense, but compared to what was previously available on the Taurus, that wheel and tire combination is massive.

Author(s): E. J. Triche, J. H. Beno, H. E. Tims, M. T. Worthington, J. R. Mock
Founder Sam Pearce describes his design idea: “In 2007 my idea of a wheel with tangential suspension was born when I was sitting at Eindhoven airport waiting for a flight. I saw a mother pushing her child in a buggy. The front wheels hit a slight kerb and the child jolted forward because of the impact. I asked myself why a wheel couldn’t have suspension inside it, so it would soften an impact from any direction. I sketched the idea in my notebook, got on my flight, and didn’t think much more about it for a couple of years.”