Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/45-18 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.04 (686.7) | 25.72 (653.2) | -1.32 (-33.5) -4.9% |
| Width inches (mm) | 10.04 (255) | 9.65 (245) | -0.39 (-10) -3.9% |
| Circum. inches (mm) | 84.93 (2157.33) | 80.79 (2052.09) | -4.14 (-105.24) -4.9% |
| Sidewall Height inches (mm) | 4.52 (114.75) | 3.86 (98) | -0.66 (-16.75) -14.6% |
| Revolutions per mile (km) | 745.99 (463.53) | 784.25 (487.31) | 38.26 (23.77) 5.1% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.02 mph (30.62 km/h) |
| 25 mph (40.23 km/h) | 23.78 mph (38.27 km/h) |
| 30 mph (48.28 km/h) | 28.54 mph (45.93 km/h) |
| 35 mph (56.33 km/h) | 33.29 mph (53.58 km/h) |
| 40 mph (64.37 km/h) | 38.05 mph (61.23 km/h) |
| 45 mph (72.42 km/h) | 42.8 mph (68.89 km/h) |
| 50 mph (80.47 km/h) | 47.56 mph (76.54 km/h) |
| 55 mph (88.51 km/h) | 52.32 mph (84.2 km/h) |
| 60 mph (96.56 km/h) | 57.07 mph (91.85 km/h) |
| 65 mph (104.61 km/h) | 61.83 mph (99.5 km/h) |
| 70 mph (112.65 km/h) | 66.59 mph (107.16 km/h) |
| 75 mph (120.7 km/h) | 71.34 mph (114.81 km/h) |
| 80 mph (128.75 km/h) | 76.1 mph (122.47 km/h) |
| 85 mph (136.79 km/h) | 80.85 mph (130.12 km/h) |
| 90 mph (144.84 km/h) | 85.61 mph (137.78 km/h) |
| 95 mph (152.89 km/h) | 90.37 mph (145.43 km/h) |
| 100 mph (160.93 km/h) | 95.12 mph (153.08 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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