Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-18 | 275/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.98 (685.2) | 27.74 (704.7) | 0.77 (19.5) 2.8% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 84.75 (2152.62) | 87.16 (2213.88) | 2.41 (61.26) 2.8% |
| Sidewall Height inches (mm) | 4.49 (114) | 4.87 (123.75) | 0.38 (9.75) 8.6% |
| Revolutions per mile (km) | 747.62 (464.55) | 726.93 (451.69) | -20.69 (-12.85) -2.8% |
275/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.57 mph (33.1 km/h) |
| 25 mph (40.23 km/h) | 25.71 mph (41.38 km/h) |
| 30 mph (48.28 km/h) | 30.85 mph (49.65 km/h) |
| 35 mph (56.33 km/h) | 36 mph (57.93 km/h) |
| 40 mph (64.37 km/h) | 41.14 mph (66.21 km/h) |
| 45 mph (72.42 km/h) | 46.28 mph (74.48 km/h) |
| 50 mph (80.47 km/h) | 51.42 mph (82.76 km/h) |
| 55 mph (88.51 km/h) | 56.57 mph (91.03 km/h) |
| 60 mph (96.56 km/h) | 61.71 mph (99.31 km/h) |
| 65 mph (104.61 km/h) | 66.85 mph (107.58 km/h) |
| 70 mph (112.65 km/h) | 71.99 mph (115.86 km/h) |
| 75 mph (120.7 km/h) | 77.13 mph (124.14 km/h) |
| 80 mph (128.75 km/h) | 82.28 mph (132.41 km/h) |
| 85 mph (136.79 km/h) | 87.42 mph (140.69 km/h) |
| 90 mph (144.84 km/h) | 92.56 mph (148.96 km/h) |
| 95 mph (152.89 km/h) | 97.7 mph (157.24 km/h) |
| 100 mph (160.93 km/h) | 102.85 mph (165.51 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1850 | 2149 | 2314 | 2417 | 2527 | 2606 | 2692 | 2795 | 2936 | 3078 | 3235 | 3361 | 3590 | 3842 | 4038 | 4164 | 4235 | 4495 | 4857 | 5644 |
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