Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 33/12.5-18 | 325/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.02 (838.8) | 34.63 (879.7) | 1.61 (40.9) 4.9% |
| Width inches (mm) | 12.52 (318) | 12.8 (325) | 0.28 (7) 2.2% |
| Circum. inches (mm) | 103.75 (2635.17) | 108.81 (2763.66) | 5.06 (128.49) 4.9% |
| Sidewall Height inches (mm) | 7.51 (190.8) | 8.32 (211.25) | 0.81 (20.45) 10.7% |
| Revolutions per mile (km) | 610.72 (379.48) | 582.32 (361.84) | -28.39 (-17.64) -4.6% |
325/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.98 mph (33.76 km/h) |
| 25 mph (40.23 km/h) | 26.22 mph (42.2 km/h) |
| 30 mph (48.28 km/h) | 31.46 mph (50.63 km/h) |
| 35 mph (56.33 km/h) | 36.71 mph (59.07 km/h) |
| 40 mph (64.37 km/h) | 41.95 mph (67.51 km/h) |
| 45 mph (72.42 km/h) | 47.19 mph (75.95 km/h) |
| 50 mph (80.47 km/h) | 52.44 mph (84.39 km/h) |
| 55 mph (88.51 km/h) | 57.68 mph (92.83 km/h) |
| 60 mph (96.56 km/h) | 62.93 mph (101.27 km/h) |
| 65 mph (104.61 km/h) | 68.17 mph (109.71 km/h) |
| 70 mph (112.65 km/h) | 73.41 mph (118.15 km/h) |
| 75 mph (120.7 km/h) | 78.66 mph (126.59 km/h) |
| 80 mph (128.75 km/h) | 83.9 mph (135.03 km/h) |
| 85 mph (136.79 km/h) | 89.14 mph (143.46 km/h) |
| 90 mph (144.84 km/h) | 94.39 mph (151.9 km/h) |
| 95 mph (152.89 km/h) | 99.63 mph (160.34 km/h) |
| 100 mph (160.93 km/h) | 104.88 mph (168.78 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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