Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-18 | 275/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.22 (742.2) | 32.07 (814.7) | 2.85 (72.5) 9.8% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 91.8 (2331.69) | 100.77 (2559.46) | 8.97 (227.77) 9.8% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 7.04 (178.75) | 1.43 (36.25) 25.4% |
| Revolutions per mile (km) | 690.2 (428.87) | 628.78 (390.71) | -61.42 (-38.17) -8.9% |
275/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.95 mph (35.33 km/h) |
| 25 mph (40.23 km/h) | 27.44 mph (44.16 km/h) |
| 30 mph (48.28 km/h) | 32.93 mph (53 km/h) |
| 35 mph (56.33 km/h) | 38.42 mph (61.83 km/h) |
| 40 mph (64.37 km/h) | 43.91 mph (70.66 km/h) |
| 45 mph (72.42 km/h) | 49.4 mph (79.49 km/h) |
| 50 mph (80.47 km/h) | 54.88 mph (88.33 km/h) |
| 55 mph (88.51 km/h) | 60.37 mph (97.16 km/h) |
| 60 mph (96.56 km/h) | 65.86 mph (105.99 km/h) |
| 65 mph (104.61 km/h) | 71.35 mph (114.83 km/h) |
| 70 mph (112.65 km/h) | 76.84 mph (123.66 km/h) |
| 75 mph (120.7 km/h) | 82.33 mph (132.49 km/h) |
| 80 mph (128.75 km/h) | 87.81 mph (141.32 km/h) |
| 85 mph (136.79 km/h) | 93.3 mph (150.16 km/h) |
| 90 mph (144.84 km/h) | 98.79 mph (158.99 km/h) |
| 95 mph (152.89 km/h) | 104.28 mph (167.82 km/h) |
| 100 mph (160.93 km/h) | 109.77 mph (176.66 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1600 | 1859 | 2002 | 2090 | 2186 | 2254 | 2329 | 2417 | 2540 | 2662 | 2799 | 2907 | 3105 | 3323 | 3493 | 3602 | 3663 | 3888 | 4201 | 4882 |
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