Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/85-18 | 275/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.07 (941.7) | 33.16 (842.2) | -3.92 (-99.5) -10.6% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 116.47 (2958.44) | 104.17 (2645.85) | -12.31 (-312.59) -10.6% |
| Sidewall Height inches (mm) | 9.54 (242.25) | 7.58 (192.5) | -1.96 (-49.75) -20.5% |
| Revolutions per mile (km) | 543.98 (338.02) | 608.25 (377.95) | 64.27 (39.93) 11.8% |
275/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.89 mph (28.79 km/h) |
| 25 mph (40.23 km/h) | 22.36 mph (35.98 km/h) |
| 30 mph (48.28 km/h) | 26.83 mph (43.18 km/h) |
| 35 mph (56.33 km/h) | 31.3 mph (50.38 km/h) |
| 40 mph (64.37 km/h) | 35.77 mph (57.57 km/h) |
| 45 mph (72.42 km/h) | 40.25 mph (64.77 km/h) |
| 50 mph (80.47 km/h) | 44.72 mph (71.97 km/h) |
| 55 mph (88.51 km/h) | 49.19 mph (79.16 km/h) |
| 60 mph (96.56 km/h) | 53.66 mph (86.36 km/h) |
| 65 mph (104.61 km/h) | 58.13 mph (93.55 km/h) |
| 70 mph (112.65 km/h) | 62.6 mph (100.75 km/h) |
| 75 mph (120.7 km/h) | 67.08 mph (107.95 km/h) |
| 80 mph (128.75 km/h) | 71.55 mph (115.14 km/h) |
| 85 mph (136.79 km/h) | 76.02 mph (122.34 km/h) |
| 90 mph (144.84 km/h) | 80.49 mph (129.54 km/h) |
| 95 mph (152.89 km/h) | 84.96 mph (136.73 km/h) |
| 100 mph (160.93 km/h) | 89.43 mph (143.93 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
