Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/55-20 | 225/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.18 (766.5) | 30.4 (772.2) | 0.22 (5.7) 0.7% |
| Width inches (mm) | 9.25 (235) | 8.86 (225) | -0.39 (-10) -4.3% |
| Circum. inches (mm) | 94.8 (2408.03) | 95.51 (2425.94) | 0.71 (17.91) 0.7% |
| Sidewall Height inches (mm) | 5.09 (129.25) | 6.2 (157.5) | 1.11 (28.25) 21.9% |
| Revolutions per mile (km) | 668.32 (415.28) | 663.39 (412.21) | -4.93 (-3.07) -0.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.15 mph (32.43 km/h) |
| 25 mph (40.23 km/h) | 25.19 mph (40.53 km/h) |
| 30 mph (48.28 km/h) | 30.22 mph (48.64 km/h) |
| 35 mph (56.33 km/h) | 35.26 mph (56.75 km/h) |
| 40 mph (64.37 km/h) | 40.3 mph (64.85 km/h) |
| 45 mph (72.42 km/h) | 45.33 mph (72.96 km/h) |
| 50 mph (80.47 km/h) | 50.37 mph (81.07 km/h) |
| 55 mph (88.51 km/h) | 55.41 mph (89.17 km/h) |
| 60 mph (96.56 km/h) | 60.45 mph (97.28 km/h) |
| 65 mph (104.61 km/h) | 65.48 mph (105.39 km/h) |
| 70 mph (112.65 km/h) | 70.52 mph (113.49 km/h) |
| 75 mph (120.7 km/h) | 75.56 mph (121.6 km/h) |
| 80 mph (128.75 km/h) | 80.59 mph (129.71 km/h) |
| 85 mph (136.79 km/h) | 85.63 mph (137.81 km/h) |
| 90 mph (144.84 km/h) | 90.67 mph (145.92 km/h) |
| 95 mph (152.89 km/h) | 95.71 mph (154.02 km/h) |
| 100 mph (160.93 km/h) | 100.74 mph (162.13 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1688 | 1961 | 2112 | 2205 | 2306 | 2378 | 2457 | 2550 | 2680 | 2809 | 2953 | 3067 | 3276 | 3506 | 3685 | 3800 | 3865 | 4102 | 4432 | 5151 |
Better Fuel Economy Factory Ratios Increased Power
