Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-18 | 255/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.97 (659.7) | 32.06 (814.2) | 6.08 (154.5) 23.4% |
| Width inches (mm) | 8.86 (225) | 10.04 (255) | 1.18 (30) 13.3% |
| Circum. inches (mm) | 81.59 (2072.51) | 100.7 (2557.88) | 19.11 (485.38) 23.4% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 7.03 (178.5) | 3.04 (77.25) 76.3% |
| Revolutions per mile (km) | 776.52 (482.51) | 629.17 (390.95) | -147.35 (-91.56) -19% |
255/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.68 mph (39.73 km/h) |
| 25 mph (40.23 km/h) | 30.85 mph (49.66 km/h) |
| 30 mph (48.28 km/h) | 37.03 mph (59.59 km/h) |
| 35 mph (56.33 km/h) | 43.2 mph (69.52 km/h) |
| 40 mph (64.37 km/h) | 49.37 mph (79.45 km/h) |
| 45 mph (72.42 km/h) | 55.54 mph (89.38 km/h) |
| 50 mph (80.47 km/h) | 61.71 mph (99.31 km/h) |
| 55 mph (88.51 km/h) | 67.88 mph (109.24 km/h) |
| 60 mph (96.56 km/h) | 74.05 mph (119.18 km/h) |
| 65 mph (104.61 km/h) | 80.22 mph (129.11 km/h) |
| 70 mph (112.65 km/h) | 86.39 mph (139.04 km/h) |
| 75 mph (120.7 km/h) | 92.56 mph (148.97 km/h) |
| 80 mph (128.75 km/h) | 98.74 mph (158.9 km/h) |
| 85 mph (136.79 km/h) | 104.91 mph (168.83 km/h) |
| 90 mph (144.84 km/h) | 111.08 mph (178.76 km/h) |
| 95 mph (152.89 km/h) | 117.25 mph (188.69 km/h) |
| 100 mph (160.93 km/h) | 123.42 mph (198.63 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1601 | 1860 | 2003 | 2092 | 2187 | 2255 | 2330 | 2419 | 2541 | 2664 | 2800 | 2909 | 3107 | 3325 | 3495 | 3604 | 3666 | 3890 | 4204 | 4885 |
Better Fuel Economy Factory Ratios Increased Power
