Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 155/90-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 30.98 (787) | 0.58 (14.8) 1.9% |
| Width inches (mm) | 6.89 (175) | 6.1 (155) | -0.79 (-20) -11.4% |
| Circum. inches (mm) | 95.51 (2425.94) | 97.34 (2472.43) | 1.83 (46.5) 1.9% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 5.49 (139.5) | -0.71 (-18) -11.4% |
| Revolutions per mile (km) | 663.39 (412.21) | 650.92 (404.46) | -12.48 (-7.75) -1.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.38 mph (32.8 km/h) |
| 25 mph (40.23 km/h) | 25.48 mph (41 km/h) |
| 30 mph (48.28 km/h) | 30.57 mph (49.21 km/h) |
| 35 mph (56.33 km/h) | 35.67 mph (57.41 km/h) |
| 40 mph (64.37 km/h) | 40.77 mph (65.61 km/h) |
| 45 mph (72.42 km/h) | 45.86 mph (73.81 km/h) |
| 50 mph (80.47 km/h) | 50.96 mph (82.01 km/h) |
| 55 mph (88.51 km/h) | 56.05 mph (90.21 km/h) |
| 60 mph (96.56 km/h) | 61.15 mph (98.41 km/h) |
| 65 mph (104.61 km/h) | 66.25 mph (106.61 km/h) |
| 70 mph (112.65 km/h) | 71.34 mph (114.81 km/h) |
| 75 mph (120.7 km/h) | 76.44 mph (123.01 km/h) |
| 80 mph (128.75 km/h) | 81.53 mph (131.22 km/h) |
| 85 mph (136.79 km/h) | 86.63 mph (139.42 km/h) |
| 90 mph (144.84 km/h) | 91.72 mph (147.62 km/h) |
| 95 mph (152.89 km/h) | 96.82 mph (155.82 km/h) |
| 100 mph (160.93 km/h) | 101.92 mph (164.02 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1656 | 1924 | 2072 | 2164 | 2263 | 2333 | 2411 | 2502 | 2629 | 2756 | 2897 | 3010 | 3214 | 3440 | 3616 | 3729 | 3792 | 4025 | 4349 | 5054 |
Better Fuel Economy Factory Ratios Increased Power
