R909-2-6. Tire Load Provisions

(1) Except for steering axles, self-steering VLS and retractable axles, or wide based tires, that are 14 inches wide or greater as indicated by the manufacturer's sidewall rating, all axles weighing more than 11,000 pounds shall have at least four tires per axle.

(a) For example: A tridem axle group that is designed for equalized weight distribution, equipped with single tires less than 14 inches in width, will be allowed 33,000 pounds. A tandem axle group that is designed for equalized weight distribution, equipped with single tires less than 14 inches in width will be allowed 22,000 pounds. All axles in the group must be duals or super singles to be allowed maximum weight.

(2) In circumstances where weight limitations are based on tire width, the manufacturer's size, as indicated on the sidewall will be used to determine maximum tire width:

(a) for non-permitted or legal vehicles, no tire shall exceed 600 pounds per inch of tire width as indicated on the sidewall;

(b) tire loading on vehicles requiring a Divisible overweight permit shall not exceed 500 pounds per inch of tire width for tires 11 inches wide or greater;

(c) tires that are greater than 11 inches but less than 14 inches shall have a weight limit not to exceed 5500 pounds;

(d) tires less than 11 inches wide shall not exceed 450 pounds per inch of tire width; and

(e) except as provided in R909-2-6, single axle loading shall not exceed 20,000 pounds, and tandem axle loading shall not exceed 34,000 pounds.