Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 225/90-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 35.94 (913) | 9.91 (251.8) 38.1% |
| Width inches (mm) | 4.72 (120) | 8.86 (225) | 4.13 (105) 87.5% |
| Circum. inches (mm) | 81.78 (2077.22) | 112.92 (2868.27) | 31.14 (791.05) 38.1% |
| Sidewall Height inches (mm) | 4.02 (102) | 7.97 (202.5) | 3.96 (100.5) 98.5% |
| Revolutions per mile (km) | 774.76 (481.41) | 561.08 (348.64) | -213.67 (-132.77) -27.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.62 mph (44.44 km/h) |
| 25 mph (40.23 km/h) | 34.52 mph (55.56 km/h) |
| 30 mph (48.28 km/h) | 41.42 mph (66.67 km/h) |
| 35 mph (56.33 km/h) | 48.33 mph (77.78 km/h) |
| 40 mph (64.37 km/h) | 55.23 mph (88.89 km/h) |
| 45 mph (72.42 km/h) | 62.14 mph (100 km/h) |
| 50 mph (80.47 km/h) | 69.04 mph (111.11 km/h) |
| 55 mph (88.51 km/h) | 75.95 mph (122.22 km/h) |
| 60 mph (96.56 km/h) | 82.85 mph (133.33 km/h) |
| 65 mph (104.61 km/h) | 89.75 mph (144.44 km/h) |
| 70 mph (112.65 km/h) | 96.66 mph (155.56 km/h) |
| 75 mph (120.7 km/h) | 103.56 mph (166.67 km/h) |
| 80 mph (128.75 km/h) | 110.47 mph (177.78 km/h) |
| 85 mph (136.79 km/h) | 117.37 mph (188.89 km/h) |
| 90 mph (144.84 km/h) | 124.27 mph (200 km/h) |
| 95 mph (152.89 km/h) | 131.18 mph (211.11 km/h) |
| 100 mph (160.93 km/h) | 138.08 mph (222.22 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1428 | 1659 | 1786 | 1865 | 1950 | 2011 | 2078 | 2157 | 2266 | 2376 | 2497 | 2594 | 2771 | 2965 | 3117 | 3214 | 3269 | 3469 | 3749 | 4356 |
Better Fuel Economy Factory Ratios Increased Power
