Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/30-18 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.73 (628.2) | 25.72 (653.2) | 0.98 (25) 4% |
| Width inches (mm) | 11.22 (285) | 9.65 (245) | -1.57 (-40) -14% |
| Circum. inches (mm) | 77.7 (1973.55) | 80.79 (2052.09) | 3.09 (78.54) 4% |
| Sidewall Height inches (mm) | 3.37 (85.5) | 3.86 (98) | 0.49 (12.5) 14.6% |
| Revolutions per mile (km) | 815.46 (506.7) | 784.25 (487.31) | -31.21 (-19.39) -3.8% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.8 mph (33.47 km/h) |
| 25 mph (40.23 km/h) | 25.99 mph (41.83 km/h) |
| 30 mph (48.28 km/h) | 31.19 mph (50.2 km/h) |
| 35 mph (56.33 km/h) | 36.39 mph (58.57 km/h) |
| 40 mph (64.37 km/h) | 41.59 mph (66.94 km/h) |
| 45 mph (72.42 km/h) | 46.79 mph (75.3 km/h) |
| 50 mph (80.47 km/h) | 51.99 mph (83.67 km/h) |
| 55 mph (88.51 km/h) | 57.19 mph (92.04 km/h) |
| 60 mph (96.56 km/h) | 62.39 mph (100.4 km/h) |
| 65 mph (104.61 km/h) | 67.59 mph (108.77 km/h) |
| 70 mph (112.65 km/h) | 72.79 mph (117.14 km/h) |
| 75 mph (120.7 km/h) | 77.98 mph (125.5 km/h) |
| 80 mph (128.75 km/h) | 83.18 mph (133.87 km/h) |
| 85 mph (136.79 km/h) | 88.38 mph (142.24 km/h) |
| 90 mph (144.84 km/h) | 93.58 mph (150.61 km/h) |
| 95 mph (152.89 km/h) | 98.78 mph (158.97 km/h) |
| 100 mph (160.93 km/h) | 103.98 mph (167.34 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1996 | 2318 | 2497 | 2607 | 2726 | 2811 | 2904 | 3015 | 3168 | 3321 | 3490 | 3626 | 3873 | 4144 | 4357 | 4493 | 4569 | 4849 | 5240 | 6089 |
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