Two kinds of tires for specialized performance
Due to their soft sidewalls, the crowns of radial tires stick to the road on contact. Their imprint, shorter but wider than that of a bias tire, provides added grip when leaning in heavily at corners. The pressure of the air in contact with the tire surface is distributed more effectively with radial tires, which results in more even tread wear over time.
Radial tires also provide greater comfort at higher speeds, once again as a result of their soft sidewalls which absorb the impact of imperfections on the road surface. On the other hand, bias tires are able to carry a greater weight because their sidewalls are more rigid. At high speeds, bias tires can become so deformed that their performance is affected.
Ultimately, bias tires are suitable for vehicles traveling at moderate speeds, with small to medium-sized engines and flexible chassis. They are also suited to heavy motorcycles or those that are heavily loaded.
Radial tires are needed for more powerful vehicles with very rigid chassis and for more sporty purposes. They allow you to reach ZR speed ratings, above 240 km/h.