Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 285/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 38.2 (970.2) | 7.8 (198) 25.6% |
| Width inches (mm) | 6.89 (175) | 11.22 (285) | 4.33 (110) 62.9% |
| Circum. inches (mm) | 95.51 (2425.94) | 120 (3047.97) | 24.49 (622.04) 25.6% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 10.1 (256.5) | 3.9 (99) 62.9% |
| Revolutions per mile (km) | 663.39 (412.21) | 528 (328.09) | -135.39 (-84.12) -20.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.13 mph (40.44 km/h) |
| 25 mph (40.23 km/h) | 31.41 mph (50.55 km/h) |
| 30 mph (48.28 km/h) | 37.69 mph (60.66 km/h) |
| 35 mph (56.33 km/h) | 43.97 mph (70.77 km/h) |
| 40 mph (64.37 km/h) | 50.26 mph (80.88 km/h) |
| 45 mph (72.42 km/h) | 56.54 mph (90.99 km/h) |
| 50 mph (80.47 km/h) | 62.82 mph (101.1 km/h) |
| 55 mph (88.51 km/h) | 69.1 mph (111.21 km/h) |
| 60 mph (96.56 km/h) | 75.38 mph (121.32 km/h) |
| 65 mph (104.61 km/h) | 81.67 mph (131.43 km/h) |
| 70 mph (112.65 km/h) | 87.95 mph (141.54 km/h) |
| 75 mph (120.7 km/h) | 94.23 mph (151.65 km/h) |
| 80 mph (128.75 km/h) | 100.51 mph (161.76 km/h) |
| 85 mph (136.79 km/h) | 106.79 mph (171.87 km/h) |
| 90 mph (144.84 km/h) | 113.08 mph (181.98 km/h) |
| 95 mph (152.89 km/h) | 119.36 mph (192.09 km/h) |
| 100 mph (160.93 km/h) | 125.64 mph (202.2 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1344 | 1561 | 1681 | 1755 | 1835 | 1893 | 1955 | 2030 | 2133 | 2236 | 2350 | 2441 | 2607 | 2790 | 2933 | 3025 | 3076 | 3265 | 3528 | 4100 |
Better Fuel Economy Factory Ratios Increased Power
