Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 290/80-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 38.27 (972) | 7.87 (199.8) 25.9% |
| Width inches (mm) | 6.89 (175) | 11.42 (290) | 4.53 (115) 65.7% |
| Circum. inches (mm) | 95.51 (2425.94) | 120.22 (3053.63) | 24.71 (627.69) 25.9% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 9.13 (232) | 2.93 (74.5) 47.3% |
| Revolutions per mile (km) | 663.39 (412.21) | 527.03 (327.48) | -136.36 (-84.73) -20.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.17 mph (40.52 km/h) |
| 25 mph (40.23 km/h) | 31.47 mph (50.64 km/h) |
| 30 mph (48.28 km/h) | 37.76 mph (60.77 km/h) |
| 35 mph (56.33 km/h) | 44.06 mph (70.9 km/h) |
| 40 mph (64.37 km/h) | 50.35 mph (81.03 km/h) |
| 45 mph (72.42 km/h) | 56.64 mph (91.16 km/h) |
| 50 mph (80.47 km/h) | 62.94 mph (101.29 km/h) |
| 55 mph (88.51 km/h) | 69.23 mph (111.42 km/h) |
| 60 mph (96.56 km/h) | 75.52 mph (121.55 km/h) |
| 65 mph (104.61 km/h) | 81.82 mph (131.67 km/h) |
| 70 mph (112.65 km/h) | 88.11 mph (141.8 km/h) |
| 75 mph (120.7 km/h) | 94.41 mph (151.93 km/h) |
| 80 mph (128.75 km/h) | 100.7 mph (162.06 km/h) |
| 85 mph (136.79 km/h) | 106.99 mph (172.19 km/h) |
| 90 mph (144.84 km/h) | 113.29 mph (182.32 km/h) |
| 95 mph (152.89 km/h) | 119.58 mph (192.45 km/h) |
| 100 mph (160.93 km/h) | 125.87 mph (202.58 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1341 | 1558 | 1678 | 1752 | 1832 | 1889 | 1952 | 2026 | 2129 | 2231 | 2346 | 2437 | 2602 | 2785 | 2928 | 3019 | 3070 | 3259 | 3521 | 4092 |
Better Fuel Economy Factory Ratios Increased Power
