Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/70-18 | 305/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.91 (912.2) | 33.61 (853.7) | -2.3 (-58.5) -6.4% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 112.83 (2865.76) | 105.59 (2681.98) | -7.24 (-183.78) -6.4% |
| Sidewall Height inches (mm) | 8.96 (227.5) | 7.81 (198.25) | -1.15 (-29.25) -12.9% |
| Revolutions per mile (km) | 561.58 (348.95) | 600.06 (372.86) | 38.48 (23.91) 6.9% |
305/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.72 mph (30.12 km/h) |
| 25 mph (40.23 km/h) | 23.4 mph (37.65 km/h) |
| 30 mph (48.28 km/h) | 28.08 mph (45.18 km/h) |
| 35 mph (56.33 km/h) | 32.76 mph (52.71 km/h) |
| 40 mph (64.37 km/h) | 37.43 mph (60.25 km/h) |
| 45 mph (72.42 km/h) | 42.11 mph (67.78 km/h) |
| 50 mph (80.47 km/h) | 46.79 mph (75.31 km/h) |
| 55 mph (88.51 km/h) | 51.47 mph (82.84 km/h) |
| 60 mph (96.56 km/h) | 56.15 mph (90.37 km/h) |
| 65 mph (104.61 km/h) | 60.83 mph (97.9 km/h) |
| 70 mph (112.65 km/h) | 65.51 mph (105.43 km/h) |
| 75 mph (120.7 km/h) | 70.19 mph (112.96 km/h) |
| 80 mph (128.75 km/h) | 74.87 mph (120.49 km/h) |
| 85 mph (136.79 km/h) | 79.55 mph (128.02 km/h) |
| 90 mph (144.84 km/h) | 84.23 mph (135.55 km/h) |
| 95 mph (152.89 km/h) | 88.91 mph (143.08 km/h) |
| 100 mph (160.93 km/h) | 93.59 mph (150.61 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1527 | 1774 | 1910 | 1995 | 2086 | 2151 | 2222 | 2307 | 2424 | 2541 | 2671 | 2775 | 2963 | 3171 | 3333 | 3437 | 3496 | 3710 | 4009 | 4659 |
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