Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-18 | 255/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.98 (685.2) | 27.04 (686.7) | 0.06 (1.5) 0.2% |
| Width inches (mm) | 11.22 (285) | 10.04 (255) | -1.18 (-30) -10.5% |
| Circum. inches (mm) | 84.75 (2152.62) | 84.93 (2157.33) | 0.19 (4.71) 0.2% |
| Sidewall Height inches (mm) | 4.49 (114) | 4.52 (114.75) | 0.03 (0.75) 0.7% |
| Revolutions per mile (km) | 747.62 (464.55) | 745.99 (463.53) | -1.63 (-1.01) -0.2% |
255/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.04 mph (32.26 km/h) |
| 25 mph (40.23 km/h) | 25.05 mph (40.32 km/h) |
| 30 mph (48.28 km/h) | 30.07 mph (48.39 km/h) |
| 35 mph (56.33 km/h) | 35.08 mph (56.45 km/h) |
| 40 mph (64.37 km/h) | 40.09 mph (64.51 km/h) |
| 45 mph (72.42 km/h) | 45.1 mph (72.58 km/h) |
| 50 mph (80.47 km/h) | 50.11 mph (80.64 km/h) |
| 55 mph (88.51 km/h) | 55.12 mph (88.71 km/h) |
| 60 mph (96.56 km/h) | 60.13 mph (96.77 km/h) |
| 65 mph (104.61 km/h) | 65.14 mph (104.84 km/h) |
| 70 mph (112.65 km/h) | 70.15 mph (112.9 km/h) |
| 75 mph (120.7 km/h) | 75.16 mph (120.97 km/h) |
| 80 mph (128.75 km/h) | 80.18 mph (129.03 km/h) |
| 85 mph (136.79 km/h) | 85.19 mph (137.09 km/h) |
| 90 mph (144.84 km/h) | 90.2 mph (145.16 km/h) |
| 95 mph (152.89 km/h) | 95.21 mph (153.22 km/h) |
| 100 mph (160.93 km/h) | 100.22 mph (161.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1898 | 2205 | 2375 | 2480 | 2593 | 2674 | 2763 | 2868 | 3013 | 3159 | 3320 | 3449 | 3684 | 3942 | 4144 | 4273 | 4346 | 4613 | 4984 | 5792 |
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