Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/70-17 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.54 (648.8) | 25.72 (653.2) | 0.17 (4.4) 0.7% |
| Width inches (mm) | 6.1 (155) | 9.65 (245) | 3.54 (90) 58.1% |
| Circum. inches (mm) | 80.25 (2038.27) | 80.79 (2052.09) | 0.54 (13.82) 0.7% |
| Sidewall Height inches (mm) | 4.27 (108.5) | 3.86 (98) | -0.41 (-10.5) -9.7% |
| Revolutions per mile (km) | 789.57 (490.61) | 784.25 (487.31) | -5.32 (-3.3) -0.7% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.14 mph (32.41 km/h) |
| 25 mph (40.23 km/h) | 25.17 mph (40.51 km/h) |
| 30 mph (48.28 km/h) | 30.2 mph (48.61 km/h) |
| 35 mph (56.33 km/h) | 35.24 mph (56.71 km/h) |
| 40 mph (64.37 km/h) | 40.27 mph (64.81 km/h) |
| 45 mph (72.42 km/h) | 45.31 mph (72.91 km/h) |
| 50 mph (80.47 km/h) | 50.34 mph (81.01 km/h) |
| 55 mph (88.51 km/h) | 55.37 mph (89.11 km/h) |
| 60 mph (96.56 km/h) | 60.41 mph (97.22 km/h) |
| 65 mph (104.61 km/h) | 65.44 mph (105.32 km/h) |
| 70 mph (112.65 km/h) | 70.47 mph (113.42 km/h) |
| 75 mph (120.7 km/h) | 75.51 mph (121.52 km/h) |
| 80 mph (128.75 km/h) | 80.54 mph (129.62 km/h) |
| 85 mph (136.79 km/h) | 85.58 mph (137.72 km/h) |
| 90 mph (144.84 km/h) | 90.61 mph (145.82 km/h) |
| 95 mph (152.89 km/h) | 95.64 mph (153.92 km/h) |
| 100 mph (160.93 km/h) | 100.68 mph (162.03 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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