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Lawn Mower Tire Sizes - How to read the numbers on a Lawn Mower Tire - from Outdoor Distributors

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Published on Dec 20, 2012

Hi, I'm Paige with Outdoor Distributors
And I am here to help you with understanding tire sizes one of the most commonly asked questions. These are a couple of pointers that I should point out. Tire sizes are measured in inches. The measurements are based on the tire mounted on the rim, under normal psi, with no load or weight. When applying inches to rubber, the measurements are approximate and not exact. there can be a 10 percent variance in the tire size depending on the manufacturer. This is important if you are considering mixing brands, Tires sizes vary slightly based on the number of Plies, we will cover Plies at the end of this video. These are three basic numbering systems for Lawn Equipment tires. The first is a series of 3 numbers with an X in the series. The second type is a series of 3 numbers with a slash (/) in the series. And the third is 2 numbers with a dash in between them. NHS stands for Non-highway service. This means the tire is not approved for use on the highway.The first number, 18, means the tire is approximately 18 inches in diameter or 18 inches high. The second number is 7.5 means the tire is approximately 7.5 inches wide; Note this is the tire width and not the rim width. The third number is the inner diameter of the tire, commonly known as the rim diameter. This means this tire will fir on a rim with an 8 inch diameter. The second type is a tire size with a series of 3 numbers with a Slash in the series, These numbers are designed for those who love math 4.10 slash 3.50 by 4 The first number is the width of the tire In this example our first number is 4.10 . This means the tire is approximately 4.1 inches wide The second number 3.5 means the tire section Height is approximately 3.5 inches The tire section Height is the easurement from the top of the tread to the bead seal. The third number 4 means the inner diameter of the tire is 4 inches.If you want to know the overall diameter or overall height of the tire Then here's your math.Your section height, plus your inner diameter, plus your section height again.Our last type is the tire with two numbers with a dash in between themIn this example our tire size is 2.80 dash 4. The first number 2.8 is the width of the tireAnd the second number is the inner diameter of the tire or the rim widthWith this type numbering system, no height is given and there is no means of determining the height So We have provided you a list of the most common sizes. Here is a few Rules of thumb Any number to the left of an X is the overall tire diameter or tire height And number following a dash is the inner diameter or rim diameter Math lovers like the slash If you see an off the wall number like 1111 or 500 then the size in these examples are 11.11 inches and 5.00 inches.

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