Final answer:
Technician A is correct regarding reduced tread wear in radial tires, while Technician B is mistaken about increased rolling resistance. Radial tires, which are developed with strong fibrous materials, tend to offer longer tread life and improved efficiency. Additionally, larger-diameter high-speed tires are better for reducing centripetal force-related stress.
Step-by-step explanation:
Technician A is correct in saying that radial tire belt construction provides reduced tread wear. This is because the radial tire design, such as the one developed by Goodyear using a fibrous material that offers incredible strength, leads to an extended tread life, in some cases by as much as 10,000 miles more than conventional radial tires. On the other hand, Technician B is not necessarily correct, as radial tires do not inherently increase the rolling resistance; in fact, they are generally known to offer better fuel efficiency due to their reduced rolling resistance.
When it comes to reducing stress on high-speed tires, related to centripetal force, larger-diameter tires would be preferable as they would experience less rotational stress at the same speed compared to smaller-diameter tires. This principle can also be understood by considering the concept of bead radius, where a larger radius indicates less speed for the same weight and drag force, leading to reduced stress on the tire.