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Knowledge Center

Finding The Right Size Tire
You can find the size of your tire on the sidewall. ATV, Golf Cart and Lawn/Garden tires are most commonly measured by Height x Width x Inner Wheel Diameter

These tire are mostly measured by tire width x wheel diameter.
Farm Tires are a little tricky. Bias farm is measured by tire width x wheel diameter.
Radial farm tires can be measures by the old style which is tirewidth x wheel diameter andthe new metric measurements are width/aspect ratio (height to width ratio sidewall to tread) and wheel diameter (which is in inches). I know… Its kind of confusing, if you need help, call us! We know this stuff.
Sizes are displayed on the sidewall of every tire. We recommend that you replace the same size tire, but keep in mind that you can alternate the ply/load rating to suit your needs and application, but the basic size will stay the same.

Tire Pressure
It is always recommended to run your tires with the manufacturers suggested air pressure. The tires air pressure is indicated on the sidewall of every tire. Tire pressure is measured in psi (pounds per square inch).
It is never recommended to exceed the maximum inflation pressure that is indicated on the sidewall of the tire.
The air is what actually carries the load of the vehicle. So, that’s how important it is to be sure that your air pressure is correct and accurate based on the load capacity. It is important to check tire pressure when the tire is cold, ideally before every ride. Tire pressure should never be adjusted after a tire has been in use.

Load Rating and Ply Rating
Every tire has some sort of load rating index or carrying capacity designation. The load/ply rating indicates the over-all load capacity or capability of the tire.
The tire load rating will tell the equipment and/or vehicle owner the amount of weight each tire can safely carry when properly inflated. The weight of the vehicle is not always distributed evenly among all four tires, each tire then has its particular amount of weight to support depending on the vehicle and axle and weight distribution. It is critical to be sure that each tire is inflated properly to “carry it’s weight” so to speak.
All conventional sized radials for agricultural applications are marked with the star ratings. This specifies the maximum load rating for the designated inflation pressure.
★Max load @ 18 psi
★★Max load @ 24 psi
★★★Max load @ 30 psi.

All metric sized radials for agricultural applications are marked with a load index and speed symbol (see chart) need to get chart

ST Radial Tires

The load carrying capacities for RV, Trailers, Toy Haulers, Boat Trailers, 5th Wheels applications from the manufacturers (or OE) are a lot of time made to carry the maximum gross vehicle weight of that specified vehicle. What commonly happens is your trailer or vehicle is fully or “over” loaded. Since you are already at (or in many cases above) the maximum gross vehicle weight for your tires, there is a chance or probability of a blow-out. If your tires are not fully inflated, then the tires will overloaded as well.
An example is, if the maximum air pressure of the tire is 60lbs psi and your tires only have 50lbs psi they will not carry that gross vehicle weight rating that you should have for your haul. This is EXTREMELY important in choosing a replacement tire for your vehicle, trailer tire, RV, Toy Hauler, etc. you may want to step up to a higher ply rating and increase your load carrying capacity, thus giving you more wiggle room on your air pressure to ensure that you are not overloading your tires. Nobody wants a blow out or a flat tire on vacation or on the way to a big job or race.
ATV / UTV  – star rating and ply rating
Some ATV tires have the ply rating on the sidewall. If the sidewall does not show a number ply rating, it may be displayed as a star symbol ply rating.
Each star equals a 2ply rating.
★= 2ply
★★= 4ply
★★★= 6ply