Issue link: https://read.dmtmag.com/i/34500
OPERATION AND HANDLING OVER-STEER Over-steer is when the rear wheels are carving a larger arc than the front wheels or the intended line of the turn. This is often described as a “loose” condition, as the truck feels like the rear end is coming around. UNDER-STEER Under-steer is when the front wheels are carving a larger arc than the rear wheels. This is often described as “push” or “pushing,” as the front end feels like it is plowing off of a corner. Over-steer: Very Difficult to Correct Under-steer: Very Easy to Correct Over-steer is dangerous because once the rear end comes around, the vehicle is uncontrollable and may enter a spin. Braking only makes this condition worse. Under-steer is the more desirable condition because you have direct control over the front tires, and deceleration usually corrects the condition. The MICHELIN ® X One tire has a higher cornering stiffness and can generate ® more lateral force than standard dual drive tires. Increasing cornering stiffness of the rear tires promotes under-steer. Additionally, it will take more force to jack- knife the vehicle. CORNERING STIFFNESS FOR DIFFERENT TIRES 7,000 6,000 5,000 4,000 3,000 2,000 1,000 0 MICHELIN X One Tire Two Dual ® ® 0 5,000 10,000 15,000 20,000 25,000 30,000 40,000 45,000 50,000 Normal Force (N) Source: Recent evaluations at a MICHELIN facility in South Carolina. 58 Operation and Handling Conventional Wide-Base Cornering Stiffness (N/Deg)