Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 225/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 26.86 (682.2) | 0.87 (22) 3.3% |
| Width inches (mm) | 5.71 (145) | 8.86 (225) | 3.15 (80) 55.2% |
| Circum. inches (mm) | 81.66 (2074.08) | 84.38 (2143.19) | 2.72 (69.12) 3.3% |
| Sidewall Height inches (mm) | 4 (101.5) | 4.43 (112.5) | 0.43 (11) 10.8% |
| Revolutions per mile (km) | 775.93 (482.14) | 750.91 (466.59) | -25.02 (-15.55) -3.2% |
225/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.67 mph (33.26 km/h) |
| 25 mph (40.23 km/h) | 25.83 mph (41.57 km/h) |
| 30 mph (48.28 km/h) | 31 mph (49.89 km/h) |
| 35 mph (56.33 km/h) | 36.17 mph (58.2 km/h) |
| 40 mph (64.37 km/h) | 41.33 mph (66.52 km/h) |
| 45 mph (72.42 km/h) | 46.5 mph (74.83 km/h) |
| 50 mph (80.47 km/h) | 51.67 mph (83.15 km/h) |
| 55 mph (88.51 km/h) | 56.83 mph (91.46 km/h) |
| 60 mph (96.56 km/h) | 62 mph (99.78 km/h) |
| 65 mph (104.61 km/h) | 67.17 mph (108.09 km/h) |
| 70 mph (112.65 km/h) | 72.33 mph (116.41 km/h) |
| 75 mph (120.7 km/h) | 77.5 mph (124.72 km/h) |
| 80 mph (128.75 km/h) | 82.67 mph (133.04 km/h) |
| 85 mph (136.79 km/h) | 87.83 mph (141.35 km/h) |
| 90 mph (144.84 km/h) | 93 mph (149.67 km/h) |
| 95 mph (152.89 km/h) | 98.17 mph (157.98 km/h) |
| 100 mph (160.93 km/h) | 103.33 mph (166.3 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1911 | 2220 | 2391 | 2496 | 2610 | 2692 | 2781 | 2887 | 3033 | 3179 | 3342 | 3472 | 3708 | 3968 | 4171 | 4302 | 4375 | 4643 | 5017 | 5830 |
Better Fuel Economy Factory Ratios Increased Power
