Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-18 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.33 (668.7) | 25.72 (653.2) | -0.61 (-15.5) -2.3% |
| Width inches (mm) | 9.25 (235) | 9.65 (245) | 0.39 (10) 4.3% |
| Circum. inches (mm) | 82.71 (2100.78) | 80.79 (2052.09) | -1.92 (-48.69) -2.3% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 3.86 (98) | -0.31 (-7.75) -7.3% |
| Revolutions per mile (km) | 766.07 (476.01) | 784.25 (487.31) | 18.18 (11.3) 2.4% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.54 mph (31.44 km/h) |
| 25 mph (40.23 km/h) | 24.42 mph (39.3 km/h) |
| 30 mph (48.28 km/h) | 29.3 mph (47.16 km/h) |
| 35 mph (56.33 km/h) | 34.19 mph (55.02 km/h) |
| 40 mph (64.37 km/h) | 39.07 mph (62.88 km/h) |
| 45 mph (72.42 km/h) | 43.96 mph (70.74 km/h) |
| 50 mph (80.47 km/h) | 48.84 mph (78.6 km/h) |
| 55 mph (88.51 km/h) | 53.73 mph (86.46 km/h) |
| 60 mph (96.56 km/h) | 58.61 mph (94.32 km/h) |
| 65 mph (104.61 km/h) | 63.49 mph (102.18 km/h) |
| 70 mph (112.65 km/h) | 68.38 mph (110.04 km/h) |
| 75 mph (120.7 km/h) | 73.26 mph (117.9 km/h) |
| 80 mph (128.75 km/h) | 78.15 mph (125.76 km/h) |
| 85 mph (136.79 km/h) | 83.03 mph (133.62 km/h) |
| 90 mph (144.84 km/h) | 87.91 mph (141.48 km/h) |
| 95 mph (152.89 km/h) | 92.8 mph (149.34 km/h) |
| 100 mph (160.93 km/h) | 97.68 mph (157.2 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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