Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 225/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 33.94 (862.2) | 3.54 (90) 11.7% |
| Width inches (mm) | 6.89 (175) | 8.86 (225) | 1.97 (50) 28.6% |
| Circum. inches (mm) | 95.51 (2425.94) | 106.64 (2708.68) | 11.13 (282.74) 11.7% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 7.97 (202.5) | 1.77 (45) 28.6% |
| Revolutions per mile (km) | 663.39 (412.21) | 594.14 (369.18) | -69.25 (-43.03) -10.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.33 mph (35.94 km/h) |
| 25 mph (40.23 km/h) | 27.91 mph (44.92 km/h) |
| 30 mph (48.28 km/h) | 33.5 mph (53.91 km/h) |
| 35 mph (56.33 km/h) | 39.08 mph (62.89 km/h) |
| 40 mph (64.37 km/h) | 44.66 mph (71.88 km/h) |
| 45 mph (72.42 km/h) | 50.24 mph (80.86 km/h) |
| 50 mph (80.47 km/h) | 55.83 mph (89.85 km/h) |
| 55 mph (88.51 km/h) | 61.41 mph (98.83 km/h) |
| 60 mph (96.56 km/h) | 66.99 mph (107.82 km/h) |
| 65 mph (104.61 km/h) | 72.58 mph (116.8 km/h) |
| 70 mph (112.65 km/h) | 78.16 mph (125.78 km/h) |
| 75 mph (120.7 km/h) | 83.74 mph (134.77 km/h) |
| 80 mph (128.75 km/h) | 89.32 mph (143.75 km/h) |
| 85 mph (136.79 km/h) | 94.91 mph (152.74 km/h) |
| 90 mph (144.84 km/h) | 100.49 mph (161.72 km/h) |
| 95 mph (152.89 km/h) | 106.07 mph (170.71 km/h) |
| 100 mph (160.93 km/h) | 111.66 mph (179.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1512 | 1756 | 1892 | 1975 | 2065 | 2130 | 2200 | 2284 | 2400 | 2516 | 2644 | 2747 | 2934 | 3140 | 3301 | 3404 | 3461 | 3674 | 3970 | 4613 |
Better Fuel Economy Factory Ratios Increased Power
