Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-18 | 255/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.33 (668.7) | 27.04 (686.7) | 0.71 (18) 2.7% |
| Width inches (mm) | 9.25 (235) | 10.04 (255) | 0.79 (20) 8.5% |
| Circum. inches (mm) | 82.71 (2100.78) | 84.93 (2157.33) | 2.23 (56.55) 2.7% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 4.52 (114.75) | 0.35 (9) 8.5% |
| Revolutions per mile (km) | 766.07 (476.01) | 745.99 (463.53) | -20.08 (-12.48) -2.6% |
255/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.54 mph (33.05 km/h) |
| 25 mph (40.23 km/h) | 25.67 mph (41.32 km/h) |
| 30 mph (48.28 km/h) | 30.81 mph (49.58 km/h) |
| 35 mph (56.33 km/h) | 35.94 mph (57.84 km/h) |
| 40 mph (64.37 km/h) | 41.08 mph (66.11 km/h) |
| 45 mph (72.42 km/h) | 46.21 mph (74.37 km/h) |
| 50 mph (80.47 km/h) | 51.35 mph (82.63 km/h) |
| 55 mph (88.51 km/h) | 56.48 mph (90.9 km/h) |
| 60 mph (96.56 km/h) | 61.62 mph (99.16 km/h) |
| 65 mph (104.61 km/h) | 66.75 mph (107.42 km/h) |
| 70 mph (112.65 km/h) | 71.88 mph (115.69 km/h) |
| 75 mph (120.7 km/h) | 77.02 mph (123.95 km/h) |
| 80 mph (128.75 km/h) | 82.15 mph (132.21 km/h) |
| 85 mph (136.79 km/h) | 87.29 mph (140.48 km/h) |
| 90 mph (144.84 km/h) | 92.42 mph (148.74 km/h) |
| 95 mph (152.89 km/h) | 97.56 mph (157 km/h) |
| 100 mph (160.93 km/h) | 102.69 mph (165.27 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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