Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/65-18 | 325/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.07 (814.7) | 34.63 (879.7) | 2.56 (65) 8% |
| Width inches (mm) | 10.83 (275) | 12.8 (325) | 1.97 (50) 18.2% |
| Circum. inches (mm) | 100.77 (2559.46) | 108.81 (2763.66) | 8.04 (204.2) 8% |
| Sidewall Height inches (mm) | 7.04 (178.75) | 8.32 (211.25) | 1.28 (32.5) 18.2% |
| Revolutions per mile (km) | 628.78 (390.71) | 582.32 (361.84) | -46.46 (-28.87) -7.4% |
325/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.6 mph (34.75 km/h) |
| 25 mph (40.23 km/h) | 26.99 mph (43.44 km/h) |
| 30 mph (48.28 km/h) | 32.39 mph (52.13 km/h) |
| 35 mph (56.33 km/h) | 37.79 mph (60.82 km/h) |
| 40 mph (64.37 km/h) | 43.19 mph (69.51 km/h) |
| 45 mph (72.42 km/h) | 48.59 mph (78.2 km/h) |
| 50 mph (80.47 km/h) | 53.99 mph (86.89 km/h) |
| 55 mph (88.51 km/h) | 59.39 mph (95.58 km/h) |
| 60 mph (96.56 km/h) | 64.79 mph (104.26 km/h) |
| 65 mph (104.61 km/h) | 70.19 mph (112.95 km/h) |
| 70 mph (112.65 km/h) | 75.58 mph (121.64 km/h) |
| 75 mph (120.7 km/h) | 80.98 mph (130.33 km/h) |
| 80 mph (128.75 km/h) | 86.38 mph (139.02 km/h) |
| 85 mph (136.79 km/h) | 91.78 mph (147.71 km/h) |
| 90 mph (144.84 km/h) | 97.18 mph (156.4 km/h) |
| 95 mph (152.89 km/h) | 102.58 mph (165.09 km/h) |
| 100 mph (160.93 km/h) | 107.98 mph (173.77 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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