Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/85-18 | 275/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.07 (941.7) | 32.07 (814.7) | -5 (-127) -13.5% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 116.47 (2958.44) | 100.77 (2559.46) | -15.71 (-398.98) -13.5% |
| Sidewall Height inches (mm) | 9.54 (242.25) | 7.04 (178.75) | -2.5 (-63.5) -26.2% |
| Revolutions per mile (km) | 543.98 (338.02) | 628.78 (390.71) | 84.8 (52.69) 15.6% |
275/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.3 mph (27.85 km/h) |
| 25 mph (40.23 km/h) | 21.63 mph (34.81 km/h) |
| 30 mph (48.28 km/h) | 25.95 mph (41.77 km/h) |
| 35 mph (56.33 km/h) | 30.28 mph (48.73 km/h) |
| 40 mph (64.37 km/h) | 34.61 mph (55.69 km/h) |
| 45 mph (72.42 km/h) | 38.93 mph (62.65 km/h) |
| 50 mph (80.47 km/h) | 43.26 mph (69.62 km/h) |
| 55 mph (88.51 km/h) | 47.58 mph (76.58 km/h) |
| 60 mph (96.56 km/h) | 51.91 mph (83.54 km/h) |
| 65 mph (104.61 km/h) | 56.23 mph (90.5 km/h) |
| 70 mph (112.65 km/h) | 60.56 mph (97.46 km/h) |
| 75 mph (120.7 km/h) | 64.89 mph (104.42 km/h) |
| 80 mph (128.75 km/h) | 69.21 mph (111.38 km/h) |
| 85 mph (136.79 km/h) | 73.54 mph (118.35 km/h) |
| 90 mph (144.84 km/h) | 77.86 mph (125.31 km/h) |
| 95 mph (152.89 km/h) | 82.19 mph (132.27 km/h) |
| 100 mph (160.93 km/h) | 86.51 mph (139.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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
