Introduced by Michelin in 1948, radial tires offer superior handling and milage. But, at the expense of comfort. Take any legendary car known for comfort, slap radials on it, and that thing now gives you a Camry kind of ride. While modern cars have suspension turned for radial tires, older cars designed for bias ply tires are just awful on radials. The difference is so vast that a steel spring 111 on bias tires gives a much smoother ride than a hydraulic suspension 111 with radials.