Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/60-18 | 285/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.41 (823.2) | 33.71 (856.2) | 1.3 (33) 4% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 101.82 (2586.16) | 105.9 (2689.83) | 4.08 (103.67) 4% |
| Sidewall Height inches (mm) | 7.2 (183) | 7.85 (199.5) | 0.65 (16.5) 9% |
| Revolutions per mile (km) | 622.29 (386.67) | 598.31 (371.77) | -23.98 (-14.9) -3.9% |
285/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.8 mph (33.48 km/h) |
| 25 mph (40.23 km/h) | 26 mph (41.85 km/h) |
| 30 mph (48.28 km/h) | 31.2 mph (50.22 km/h) |
| 35 mph (56.33 km/h) | 36.4 mph (58.59 km/h) |
| 40 mph (64.37 km/h) | 41.6 mph (66.95 km/h) |
| 45 mph (72.42 km/h) | 46.8 mph (75.32 km/h) |
| 50 mph (80.47 km/h) | 52 mph (83.69 km/h) |
| 55 mph (88.51 km/h) | 57.2 mph (92.06 km/h) |
| 60 mph (96.56 km/h) | 62.41 mph (100.43 km/h) |
| 65 mph (104.61 km/h) | 67.61 mph (108.8 km/h) |
| 70 mph (112.65 km/h) | 72.81 mph (117.17 km/h) |
| 75 mph (120.7 km/h) | 78.01 mph (125.54 km/h) |
| 80 mph (128.75 km/h) | 83.21 mph (133.91 km/h) |
| 85 mph (136.79 km/h) | 88.41 mph (142.28 km/h) |
| 90 mph (144.84 km/h) | 93.61 mph (150.65 km/h) |
| 95 mph (152.89 km/h) | 98.81 mph (159.02 km/h) |
| 100 mph (160.93 km/h) | 104.01 mph (167.39 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1523 | 1769 | 1905 | 1989 | 2080 | 2145 | 2216 | 2300 | 2417 | 2533 | 2663 | 2767 | 2954 | 3162 | 3324 | 3427 | 3486 | 3700 | 3998 | 4645 |
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