Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-18 | 255/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.66 (677.2) | 27.04 (686.7) | 0.37 (9.5) 1.4% |
| Width inches (mm) | 10.83 (275) | 10.04 (255) | -0.79 (-20) -7.3% |
| Circum. inches (mm) | 83.76 (2127.49) | 84.93 (2157.33) | 1.18 (29.85) 1.4% |
| Sidewall Height inches (mm) | 4.33 (110) | 4.52 (114.75) | 0.19 (4.75) 4.3% |
| Revolutions per mile (km) | 756.45 (470.04) | 745.99 (463.53) | -10.46 (-6.5) -1.4% |
255/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.28 mph (32.64 km/h) |
| 25 mph (40.23 km/h) | 25.35 mph (40.8 km/h) |
| 30 mph (48.28 km/h) | 30.42 mph (48.96 km/h) |
| 35 mph (56.33 km/h) | 35.49 mph (57.12 km/h) |
| 40 mph (64.37 km/h) | 40.56 mph (65.28 km/h) |
| 45 mph (72.42 km/h) | 45.63 mph (73.44 km/h) |
| 50 mph (80.47 km/h) | 50.7 mph (81.6 km/h) |
| 55 mph (88.51 km/h) | 55.77 mph (89.76 km/h) |
| 60 mph (96.56 km/h) | 60.84 mph (97.92 km/h) |
| 65 mph (104.61 km/h) | 65.91 mph (106.08 km/h) |
| 70 mph (112.65 km/h) | 70.98 mph (114.23 km/h) |
| 75 mph (120.7 km/h) | 76.05 mph (122.39 km/h) |
| 80 mph (128.75 km/h) | 81.12 mph (130.55 km/h) |
| 85 mph (136.79 km/h) | 86.19 mph (138.71 km/h) |
| 90 mph (144.84 km/h) | 91.26 mph (146.87 km/h) |
| 95 mph (152.89 km/h) | 96.33 mph (155.03 km/h) |
| 100 mph (160.93 km/h) | 101.4 mph (163.19 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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