Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/30-20 | 225/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.08 (637) | 23.31 (592.2) | -1.76 (-44.8) -7% |
| Width inches (mm) | 8.46 (215) | 8.86 (225) | 0.39 (10) 4.7% |
| Circum. inches (mm) | 78.79 (2001.19) | 73.25 (1860.45) | -5.54 (-140.74) -7% |
| Sidewall Height inches (mm) | 2.54 (64.5) | 2.66 (67.5) | 0.12 (3) 4.7% |
| Revolutions per mile (km) | 804.19 (499.7) | 865.03 (537.5) | 60.84 (37.8) 7.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.59 mph (29.92 km/h) |
| 25 mph (40.23 km/h) | 23.24 mph (37.4 km/h) |
| 30 mph (48.28 km/h) | 27.89 mph (44.88 km/h) |
| 35 mph (56.33 km/h) | 32.54 mph (52.37 km/h) |
| 40 mph (64.37 km/h) | 37.19 mph (59.85 km/h) |
| 45 mph (72.42 km/h) | 41.84 mph (67.33 km/h) |
| 50 mph (80.47 km/h) | 46.48 mph (74.81 km/h) |
| 55 mph (88.51 km/h) | 51.13 mph (82.29 km/h) |
| 60 mph (96.56 km/h) | 55.78 mph (89.77 km/h) |
| 65 mph (104.61 km/h) | 60.43 mph (97.25 km/h) |
| 70 mph (112.65 km/h) | 65.08 mph (104.73 km/h) |
| 75 mph (120.7 km/h) | 69.73 mph (112.21 km/h) |
| 80 mph (128.75 km/h) | 74.37 mph (119.69 km/h) |
| 85 mph (136.79 km/h) | 79.02 mph (127.17 km/h) |
| 90 mph (144.84 km/h) | 83.67 mph (134.65 km/h) |
| 95 mph (152.89 km/h) | 88.32 mph (142.14 km/h) |
| 100 mph (160.93 km/h) | 92.97 mph (149.62 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2201 | 2557 | 2754 | 2876 | 3007 | 3101 | 3204 | 3325 | 3494 | 3663 | 3850 | 4000 | 4272 | 4571 | 4805 | 4955 | 5040 | 5349 | 5780 | 6716 |
Better Fuel Economy Factory Ratios Increased Power
