“A general rule of thumb is that when a tire gets below about 20% of its original tread depth, it may be time to start shopping for new tires, depending on the use of the tractor,” says Dave Paulk manager, field technical services, BKT USA Inc.
“Soil types and the amount of moisture also play a role in how effective tires are when they start wearing down,” he explains.
“Care should also be taken to protect tires by not driving directly over stubble in the spring. Stubble damage can chip away the outside rubber in the tread area and expose cords underneath. GMO technology is great for yields, pests, wind, etc., but terrible for tires.”
Paulk says that rubber is “no match” for the hardness of GMO stalks, especially after the winter months.
“The overall diameter in radial tires can differ between brands because of maximum growth rates and other factors. Metric-sized radial tires between manufacturers are generally close to the same overall diameter and rolling circumference and can be inter-changed between brands when needed.
“When replacing one tire that has been damaged, the tread depth needs to be matched closely with the older tires. This may require replacing a couple of tires if the older tires are 25% or more worn.
When replacing tires and matching to older tires, Paulk says that “the same load indexes should be used. Different load indexes recommend different air pressures for carrying capacity. It is best to use the same brand on an axle and match up a tire with the same brand whenever possible.”
On mechanical four-wheel drive tractors, Paulk advises to make sure tire rolling circumferences closely match if using other brands.
“With radials, brands can usually be mixed,” he says.
“Different brands can be used on the front and the rear if the lead/lag ratio is within limits. If R-1Ws are used on the rear, they should also be used on the front.
“Tread patterns should be close to the same in order to ensure good traction and mobility. Maintaining equipment and tires regularly is important to reducing downtime and fuel expenses over the long-term.”
