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4 Things You Didn't Know Your Lawn Mower Tires Are Telling You

Have you ever wondered what the numbers on the sidewall of your tires were telling you?

Getting to know a vehicle's tires can have a major impact on performance and the amount of money you'll have to put into maintenance down the line. You can find out a lot of information about a tire just by reading the series of numbers and letters on the tire sidewall. Here's a handy guide for understanding what that mess means so you can get the most out of your next tire purchase.

The numbers can be confusing, and we want to do everything we can to help you find the right tire. After all, satisfied customers are our goal. So here is an example to help tell you understand what each number means. This will guide you when purchasing a tire for your outdoor power equipment.

1. Width and Aspect Ratio

Example: 18 x 9.50 - 8

All of these dimensions are represented in inches.

18 - denotes the outside diameter of the tire in inches.

This defines the cutting height of the blades. We do not advise changing one tire at a time, because each manufacturer size might be different. For example: an 18” tire might be a 17 ¾” tire at one manufacturer; at another manufacturer an 18” tire might be 18 ¼” tire. This will result in uneven cutting patterns. For this reason, we recommend replacing both front tires at the same time and both back tires at the same time from the same manufacturer.

9.50 - denotes what the tire width is in inches.

If you purchase a tire that has a number wider than the one on the sidewall of the tire you may have clearance issues and the tire may rub. Make sure you check the clearance before purchasing a tire that is wider than the one you currently have.

8 - denotes the rim diameter in inches.

You must always purchase a tire with the same rim diameter specification otherwise the tire will not fit on the rim.

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If you still cannot find the right tire, or you need assistance in choosing one of our products for your equipment, then please do not hesitate to call one of our wonderful customer service representatives, chat with us, or send us an e-mail using one of the options on the right.

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Above: Outside Diameter of Tire

Above: Tire Width

Above: Rim Diameter
2. Tire Specifications

A tire's load rating is the last thing listed on the sidewall. If you're looking at tires for larger vehicles, such as riding mowers or snowblowers, a tire's load rating is very important. The higher the load rating, the better the tire will hold up under great pressure. It's always a good idea to go with tires that offer plenty of extra support beyond what you think you'll need. It's better to be safe than to be forced to replace a whole set down the line or to risk injury with a blowout in the middle of a project.

To Continue from the Above Example

Tire Type

Tubeless is a pneumatic or air filled tire does not require a separate inner tube to hold air pressure the bead in the tire is design to use the air pressure within the tire to force the tire to set against the rim flang and create the air tight seal.

A Tube Type tire requires a separate inner tube to hold pressure. These tubes are also available on our website.

Ply Rating

Ply Rating denotes the number of nylon cords embedded in the rubber, which play a major role in the performance and load capacity of the tire. It is generally OK to use a tire with a higher ply rating than the tire you are replacing. For example: a 6 ply tire can be used to replace a 4 ply tire but you could not use a 2 ply.

Load Rating

The Load Rating or max load denotes the maximum carrying capacity of the tire when inflated to the current pressure. It is important to not exceed this capacity because tire failure can occur.

Maximum Air Pressure

The Maximum Air Pressure is displayed as PSI or pounds per squared inch. This specification denotes maximum pressure recommended when filling the tire with air. Tires are manufactured to operate in a pressure range and it is important not to exceed tire pressure because tire failure can occur.

Above: Tire Type

Above: Ply Rating

Above: Max Load

Above: Max Pressure

3. Brand and Series
Usually the first thing listed on the tire sidewall is the brand name and series name of the tire. The brand, such as Bridgestone, Dunlop, or Michelin, will be listed first. Every tire manufacturer has its own registered names for series. If you're serious about getting particular performance specs out of your tires, it's worthwhile to learn about the differences between one series and another.

4. Model Number
The same section of the sidewall listing brand and series will also list the model number. The model number doesn't provide any information about the performance of the tire, but it's important to use the same particular model in the series if you want the same performance between tire changes.

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