Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/90-18 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.69 (754.2) | 25.72 (653.2) | -3.98 (-101) -13.4% |
| Width inches (mm) | 6.5 (165) | 9.65 (245) | 3.15 (80) 48.5% |
| Circum. inches (mm) | 93.28 (2369.39) | 80.79 (2052.09) | -12.49 (-317.3) -13.4% |
| Sidewall Height inches (mm) | 5.85 (148.5) | 3.86 (98) | -1.99 (-50.5) -34% |
| Revolutions per mile (km) | 679.22 (422.05) | 784.25 (487.31) | 105.02 (65.26) 15.5% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.32 mph (27.88 km/h) |
| 25 mph (40.23 km/h) | 21.65 mph (34.85 km/h) |
| 30 mph (48.28 km/h) | 25.98 mph (41.81 km/h) |
| 35 mph (56.33 km/h) | 30.31 mph (48.78 km/h) |
| 40 mph (64.37 km/h) | 34.64 mph (55.75 km/h) |
| 45 mph (72.42 km/h) | 38.97 mph (62.72 km/h) |
| 50 mph (80.47 km/h) | 43.3 mph (69.69 km/h) |
| 55 mph (88.51 km/h) | 47.63 mph (76.66 km/h) |
| 60 mph (96.56 km/h) | 51.96 mph (83.63 km/h) |
| 65 mph (104.61 km/h) | 56.3 mph (90.6 km/h) |
| 70 mph (112.65 km/h) | 60.63 mph (97.57 km/h) |
| 75 mph (120.7 km/h) | 64.96 mph (104.54 km/h) |
| 80 mph (128.75 km/h) | 69.29 mph (111.51 km/h) |
| 85 mph (136.79 km/h) | 73.62 mph (118.48 km/h) |
| 90 mph (144.84 km/h) | 77.95 mph (125.44 km/h) |
| 95 mph (152.89 km/h) | 82.28 mph (132.41 km/h) |
| 100 mph (160.93 km/h) | 86.61 mph (139.38 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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