Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 25.72 (653.2) | -0.28 (-7) -1.1% |
| Width inches (mm) | 5.71 (145) | 9.65 (245) | 3.94 (100) 69% |
| Circum. inches (mm) | 81.66 (2074.08) | 80.79 (2052.09) | -0.87 (-21.99) -1.1% |
| Sidewall Height inches (mm) | 4 (101.5) | 3.86 (98) | -0.14 (-3.5) -3.4% |
| Revolutions per mile (km) | 775.93 (482.14) | 784.25 (487.31) | 8.32 (5.17) 1.1% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.79 mph (31.85 km/h) |
| 25 mph (40.23 km/h) | 24.73 mph (39.81 km/h) |
| 30 mph (48.28 km/h) | 29.68 mph (47.77 km/h) |
| 35 mph (56.33 km/h) | 34.63 mph (55.73 km/h) |
| 40 mph (64.37 km/h) | 39.58 mph (63.69 km/h) |
| 45 mph (72.42 km/h) | 44.52 mph (71.65 km/h) |
| 50 mph (80.47 km/h) | 49.47 mph (79.61 km/h) |
| 55 mph (88.51 km/h) | 54.42 mph (87.58 km/h) |
| 60 mph (96.56 km/h) | 59.36 mph (95.54 km/h) |
| 65 mph (104.61 km/h) | 64.31 mph (103.5 km/h) |
| 70 mph (112.65 km/h) | 69.26 mph (111.46 km/h) |
| 75 mph (120.7 km/h) | 74.2 mph (119.42 km/h) |
| 80 mph (128.75 km/h) | 79.15 mph (127.38 km/h) |
| 85 mph (136.79 km/h) | 84.1 mph (135.34 km/h) |
| 90 mph (144.84 km/h) | 89.05 mph (143.31 km/h) |
| 95 mph (152.89 km/h) | 93.99 mph (151.27 km/h) |
| 100 mph (160.93 km/h) | 98.94 mph (159.23 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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