Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/70-18 | 325/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.81 (884.2) | 34.63 (879.7) | -0.18 (-4.5) -0.5% |
| Width inches (mm) | 12.01 (305) | 12.8 (325) | 0.79 (20) 6.6% |
| Circum. inches (mm) | 109.36 (2777.8) | 108.81 (2763.66) | -0.56 (-14.14) -0.5% |
| Sidewall Height inches (mm) | 8.41 (213.5) | 8.32 (211.25) | -0.09 (-2.25) -1.1% |
| Revolutions per mile (km) | 579.36 (360) | 582.32 (361.84) | 2.96 (1.84) 0.5% |
325/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.9 mph (32.02 km/h) |
| 25 mph (40.23 km/h) | 24.87 mph (40.03 km/h) |
| 30 mph (48.28 km/h) | 29.85 mph (48.03 km/h) |
| 35 mph (56.33 km/h) | 34.82 mph (56.04 km/h) |
| 40 mph (64.37 km/h) | 39.8 mph (64.05 km/h) |
| 45 mph (72.42 km/h) | 44.77 mph (72.05 km/h) |
| 50 mph (80.47 km/h) | 49.75 mph (80.06 km/h) |
| 55 mph (88.51 km/h) | 54.72 mph (88.06 km/h) |
| 60 mph (96.56 km/h) | 59.69 mph (96.07 km/h) |
| 65 mph (104.61 km/h) | 64.67 mph (104.08 km/h) |
| 70 mph (112.65 km/h) | 69.64 mph (112.08 km/h) |
| 75 mph (120.7 km/h) | 74.62 mph (120.09 km/h) |
| 80 mph (128.75 km/h) | 79.59 mph (128.09 km/h) |
| 85 mph (136.79 km/h) | 84.57 mph (136.1 km/h) |
| 90 mph (144.84 km/h) | 89.54 mph (144.1 km/h) |
| 95 mph (152.89 km/h) | 94.52 mph (152.11 km/h) |
| 100 mph (160.93 km/h) | 99.49 mph (160.12 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1482 | 1722 | 1854 | 1936 | 2024 | 2087 | 2157 | 2239 | 2352 | 2466 | 2592 | 2693 | 2876 | 3077 | 3235 | 3336 | 3393 | 3601 | 3891 | 4521 |
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