Lawn mower tire size is shown on the sidewall as a series of numbers indicating tire width, rim diameter, and aspect ratio.
Lawn mower tire size is typically displayed on the sidewall in a format like 15x6.00-6 or 20x8.00-10. The first number represents the overall tire diameter in inches, the second number indicates the tire width, and the last number shows the rim diameter. Some tires use a different format like 4.80/4.00-8, where the first number is the tire width, the second is the aspect ratio (sidewall height as a percentage of width), and the third is the rim diameter.
Common Lawn Mower Tire Size Formats
- 15x6.00-6 (standard format: diameter x width - rim)
- 20x8.00-10 (larger riding mower format)
- 4.80/4.00-8 (three-number format with aspect ratio)
- 18x9.5-8 (common for zero-turn mowers)
Understanding Tire Size Numbers
| Format Example | Diameter | Width | Rim Size | Aspect Ratio |
|---|---|---|---|---|
| 15x6.00-6 | 15 inches | 6.00 inches | 6 inches | N/A |
| 4.80/4.00-8 | 16.8 inches | 4.80 inches | 8 inches | 4.00 (80%) |
| 18x9.5-8 | 18 inches | 9.5 inches | 8 inches | N/A |
Finding the Correct Replacement Tire
Always match the original tire size exactly when replacing lawn mower tires. Check the sidewall for the size marking, and verify the rim diameter matches your wheel. Using the wrong size can affect mower performance, traction, and safety. If the original marking is worn off, measure the existing tire's diameter and width, then confirm the rim size before purchasing replacements.