Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/55-20 | 275/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.91 (810.5) | 33.16 (842.2) | 1.25 (31.7) 3.9% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 100.25 (2546.26) | 104.17 (2645.85) | 3.92 (99.59) 3.9% |
| Sidewall Height inches (mm) | 5.95 (151.25) | 7.58 (192.5) | 1.62 (41.25) 27.3% |
| Revolutions per mile (km) | 632.04 (392.73) | 608.25 (377.95) | -23.79 (-14.78) -3.8% |
275/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.78 mph (33.45 km/h) |
| 25 mph (40.23 km/h) | 25.98 mph (41.81 km/h) |
| 30 mph (48.28 km/h) | 31.17 mph (50.17 km/h) |
| 35 mph (56.33 km/h) | 36.37 mph (58.53 km/h) |
| 40 mph (64.37 km/h) | 41.56 mph (66.89 km/h) |
| 45 mph (72.42 km/h) | 46.76 mph (75.25 km/h) |
| 50 mph (80.47 km/h) | 51.96 mph (83.61 km/h) |
| 55 mph (88.51 km/h) | 57.15 mph (91.98 km/h) |
| 60 mph (96.56 km/h) | 62.35 mph (100.34 km/h) |
| 65 mph (104.61 km/h) | 67.54 mph (108.7 km/h) |
| 70 mph (112.65 km/h) | 72.74 mph (117.06 km/h) |
| 75 mph (120.7 km/h) | 77.93 mph (125.42 km/h) |
| 80 mph (128.75 km/h) | 83.13 mph (133.78 km/h) |
| 85 mph (136.79 km/h) | 88.32 mph (142.14 km/h) |
| 90 mph (144.84 km/h) | 93.52 mph (150.51 km/h) |
| 95 mph (152.89 km/h) | 98.72 mph (158.87 km/h) |
| 100 mph (160.93 km/h) | 103.91 mph (167.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1548 | 1798 | 1937 | 2022 | 2114 | 2180 | 2253 | 2338 | 2457 | 2575 | 2707 | 2813 | 3004 | 3214 | 3379 | 3484 | 3544 | 3761 | 4064 | 4723 |
Better Fuel Economy Factory Ratios Increased Power
