Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/70-18 | 325/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.91 (912.2) | 34.63 (879.7) | -1.28 (-32.5) -3.6% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 112.83 (2865.76) | 108.81 (2763.66) | -4.02 (-102.1) -3.6% |
| Sidewall Height inches (mm) | 8.96 (227.5) | 8.32 (211.25) | -0.64 (-16.25) -7.1% |
| Revolutions per mile (km) | 561.58 (348.95) | 582.32 (361.84) | 20.75 (12.89) 3.7% |
325/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.29 mph (31.04 km/h) |
| 25 mph (40.23 km/h) | 24.11 mph (38.8 km/h) |
| 30 mph (48.28 km/h) | 28.93 mph (46.56 km/h) |
| 35 mph (56.33 km/h) | 33.75 mph (54.32 km/h) |
| 40 mph (64.37 km/h) | 38.57 mph (62.08 km/h) |
| 45 mph (72.42 km/h) | 43.4 mph (69.84 km/h) |
| 50 mph (80.47 km/h) | 48.22 mph (77.6 km/h) |
| 55 mph (88.51 km/h) | 53.04 mph (85.36 km/h) |
| 60 mph (96.56 km/h) | 57.86 mph (93.12 km/h) |
| 65 mph (104.61 km/h) | 62.68 mph (100.88 km/h) |
| 70 mph (112.65 km/h) | 67.51 mph (108.64 km/h) |
| 75 mph (120.7 km/h) | 72.33 mph (116.4 km/h) |
| 80 mph (128.75 km/h) | 77.15 mph (124.16 km/h) |
| 85 mph (136.79 km/h) | 81.97 mph (131.92 km/h) |
| 90 mph (144.84 km/h) | 86.79 mph (139.68 km/h) |
| 95 mph (152.89 km/h) | 91.62 mph (147.44 km/h) |
| 100 mph (160.93 km/h) | 96.44 mph (155.2 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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