Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/65-20 | 275/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.07 (865.5) | 32.07 (814.7) | -2 (-50.8) -5.9% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 107.05 (2719.05) | 100.77 (2559.46) | -6.28 (-159.59) -5.9% |
| Sidewall Height inches (mm) | 7.04 (178.75) | 7.04 (178.75) | 0 (0) 0% |
| Revolutions per mile (km) | 591.88 (367.78) | 628.78 (390.71) | 36.91 (22.93) 6.2% |
275/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.83 mph (30.3 km/h) |
| 25 mph (40.23 km/h) | 23.53 mph (37.87 km/h) |
| 30 mph (48.28 km/h) | 28.24 mph (45.45 km/h) |
| 35 mph (56.33 km/h) | 32.95 mph (53.02 km/h) |
| 40 mph (64.37 km/h) | 37.65 mph (60.6 km/h) |
| 45 mph (72.42 km/h) | 42.36 mph (68.17 km/h) |
| 50 mph (80.47 km/h) | 47.07 mph (75.74 km/h) |
| 55 mph (88.51 km/h) | 51.77 mph (83.32 km/h) |
| 60 mph (96.56 km/h) | 56.48 mph (90.89 km/h) |
| 65 mph (104.61 km/h) | 61.18 mph (98.47 km/h) |
| 70 mph (112.65 km/h) | 65.89 mph (106.04 km/h) |
| 75 mph (120.7 km/h) | 70.6 mph (113.62 km/h) |
| 80 mph (128.75 km/h) | 75.3 mph (121.19 km/h) |
| 85 mph (136.79 km/h) | 80.01 mph (128.77 km/h) |
| 90 mph (144.84 km/h) | 84.72 mph (136.34 km/h) |
| 95 mph (152.89 km/h) | 89.42 mph (143.91 km/h) |
| 100 mph (160.93 km/h) | 94.13 mph (151.49 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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