Understanding the Difference Between Tractor Tires

If you don't outfit your tractor with the right tires, you will not see the best results. Understanding the difference in tires is essential for a reliable piece of equipment.

Your situation can change depending on the model of tractor you own, plus many other factors. Ask our staff at Bobcat PNW about anything related to tractor tires or if you want to shop tractors for sale. We have several locations in Washington State, and we welcome everyone from Kent and Auburn.

Standard vs. Metric Size Expression

The sidewalls on the tires of your equipment will have a collection of numbers. Deciphering these numbers is a good starting point. Manufacturers choose either the standard or metric format to express the size. 

The standard expression would show the notation as 14.9-28. In this example, 14.9 indicates the width in inches of the tire. The 28 tells what diameter wheel the tire will fit in inches. A dash means that it uses bias-ply construction.

The metric expression would show the notation as 520/85R42. This label tells us that the tire is 520mm wide, is a radial tire, and can be used with a 42-inch rim.

Why Is the Aspect Ratio Used?

You might have noticed another number in the metric expression. The 85 represents the aspect ratio shown as a percentage. It shows that the sidewall height of the tire is 85 percent of the tire's width. This percentage is necessary when replacing tires.

Radial or Bias-Ply

Bias-ply tires used for tractors are different from the ones once made for cars. Modern bias-ply tires have cords embedded into the material to create a more robust design. These are the cheaper option for tractors but will benefit anyone looking for something that will not puncture easily.

Radial tires differ from bias-ply because they use steel cords that go in one direction following the circumference. If you are looking for better traction and longer tread life, these are the tires to look for on a tractor. Keep in mind that there are higher costs with radial tires.

Common Tractor Tire Sizes

First, you must always use accurate sizes to ensure your tractor performs as it should. Messing up the ratio between the larger back tires and shorter front ones can mean an uneven and unsteady piece of equipment. When in doubt, you can consult your service manual, the manufacturer, or your local dealership for guidance. 

If you still have questions about your tractor tires or how to understand their sizing, you can trust the expertise of Bobcat PNW. Come by our Washington dealership locations, serving Kent and Auburn, to find our complete inventory of tractors and other equipment for sale.