Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/70-18 | 275/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.5 (800.2) | 32.07 (814.7) | 0.57 (14.5) 1.8% |
| Width inches (mm) | 9.65 (245) | 10.83 (275) | 1.18 (30) 12.2% |
| Circum. inches (mm) | 98.97 (2513.9) | 100.77 (2559.46) | 1.79 (45.55) 1.8% |
| Sidewall Height inches (mm) | 6.75 (171.5) | 7.04 (178.75) | 0.29 (7.25) 4.2% |
| Revolutions per mile (km) | 640.18 (397.79) | 628.78 (390.71) | -11.39 (-7.08) -1.8% |
275/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.36 mph (32.77 km/h) |
| 25 mph (40.23 km/h) | 25.45 mph (40.96 km/h) |
| 30 mph (48.28 km/h) | 30.54 mph (49.16 km/h) |
| 35 mph (56.33 km/h) | 35.63 mph (57.35 km/h) |
| 40 mph (64.37 km/h) | 40.72 mph (65.54 km/h) |
| 45 mph (72.42 km/h) | 45.82 mph (73.73 km/h) |
| 50 mph (80.47 km/h) | 50.91 mph (81.93 km/h) |
| 55 mph (88.51 km/h) | 56 mph (90.12 km/h) |
| 60 mph (96.56 km/h) | 61.09 mph (98.31 km/h) |
| 65 mph (104.61 km/h) | 66.18 mph (106.5 km/h) |
| 70 mph (112.65 km/h) | 71.27 mph (114.7 km/h) |
| 75 mph (120.7 km/h) | 76.36 mph (122.89 km/h) |
| 80 mph (128.75 km/h) | 81.45 mph (131.08 km/h) |
| 85 mph (136.79 km/h) | 86.54 mph (139.27 km/h) |
| 90 mph (144.84 km/h) | 91.63 mph (147.47 km/h) |
| 95 mph (152.89 km/h) | 96.72 mph (155.66 km/h) |
| 100 mph (160.93 km/h) | 101.81 mph (163.85 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 |
Better Fuel Economy Factory Ratios Increased Power
