Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/30-20 | 205/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.08 (637) | 28.88 (733.5) | 3.8 (96.5) 15.1% |
| Width inches (mm) | 8.46 (215) | 8.07 (205) | -0.39 (-10) -4.7% |
| Circum. inches (mm) | 78.79 (2001.19) | 90.72 (2304.36) | 11.94 (303.16) 15.1% |
| Sidewall Height inches (mm) | 2.54 (64.5) | 4.44 (112.75) | 1.9 (48.25) 74.8% |
| Revolutions per mile (km) | 804.19 (499.7) | 698.39 (433.96) | -105.8 (-65.74) -13.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.03 mph (37.06 km/h) |
| 25 mph (40.23 km/h) | 28.79 mph (46.33 km/h) |
| 30 mph (48.28 km/h) | 34.54 mph (55.59 km/h) |
| 35 mph (56.33 km/h) | 40.3 mph (64.86 km/h) |
| 40 mph (64.37 km/h) | 46.06 mph (74.13 km/h) |
| 45 mph (72.42 km/h) | 51.82 mph (83.39 km/h) |
| 50 mph (80.47 km/h) | 57.57 mph (92.66 km/h) |
| 55 mph (88.51 km/h) | 63.33 mph (101.92 km/h) |
| 60 mph (96.56 km/h) | 69.09 mph (111.19 km/h) |
| 65 mph (104.61 km/h) | 74.85 mph (120.45 km/h) |
| 70 mph (112.65 km/h) | 80.6 mph (129.72 km/h) |
| 75 mph (120.7 km/h) | 86.36 mph (138.99 km/h) |
| 80 mph (128.75 km/h) | 92.12 mph (148.25 km/h) |
| 85 mph (136.79 km/h) | 97.88 mph (157.52 km/h) |
| 90 mph (144.84 km/h) | 103.63 mph (166.78 km/h) |
| 95 mph (152.89 km/h) | 109.39 mph (176.05 km/h) |
| 100 mph (160.93 km/h) | 115.15 mph (185.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1777 | 2065 | 2223 | 2322 | 2428 | 2503 | 2586 | 2685 | 2821 | 2957 | 3108 | 3229 | 3449 | 3691 | 3880 | 4001 | 4069 | 4318 | 4666 | 5423 |
Better Fuel Economy Factory Ratios Increased Power
