Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/70-13 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 22.65 (575.2) | 25.09 (637.2) | 2.44 (62) 10.8% |
| Width inches (mm) | 6.89 (175) | 8.86 (225) | 1.97 (50) 28.6% |
| Circum. inches (mm) | 71.14 (1807.04) | 78.81 (2001.82) | 7.67 (194.78) 10.8% |
| Sidewall Height inches (mm) | 4.82 (122.5) | 3.54 (90) | -1.28 (-32.5) -26.5% |
| Revolutions per mile (km) | 890.59 (553.39) | 803.94 (499.54) | -86.66 (-53.85) -9.7% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.16 mph (35.66 km/h) |
| 25 mph (40.23 km/h) | 27.69 mph (44.57 km/h) |
| 30 mph (48.28 km/h) | 33.23 mph (53.48 km/h) |
| 35 mph (56.33 km/h) | 38.77 mph (62.4 km/h) |
| 40 mph (64.37 km/h) | 44.31 mph (71.31 km/h) |
| 45 mph (72.42 km/h) | 49.85 mph (80.23 km/h) |
| 50 mph (80.47 km/h) | 55.39 mph (89.14 km/h) |
| 55 mph (88.51 km/h) | 60.93 mph (98.05 km/h) |
| 60 mph (96.56 km/h) | 66.47 mph (106.97 km/h) |
| 65 mph (104.61 km/h) | 72.01 mph (115.88 km/h) |
| 70 mph (112.65 km/h) | 77.55 mph (124.8 km/h) |
| 75 mph (120.7 km/h) | 83.08 mph (133.71 km/h) |
| 80 mph (128.75 km/h) | 88.62 mph (142.63 km/h) |
| 85 mph (136.79 km/h) | 94.16 mph (151.54 km/h) |
| 90 mph (144.84 km/h) | 99.7 mph (160.45 km/h) |
| 95 mph (152.89 km/h) | 105.24 mph (169.37 km/h) |
| 100 mph (160.93 km/h) | 110.78 mph (178.28 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2046 | 2377 | 2560 | 2673 | 2795 | 2882 | 2977 | 3091 | 3247 | 3404 | 3578 | 3717 | 3970 | 4248 | 4466 | 4605 | 4684 | 4971 | 5372 | 6242 |
Better Fuel Economy Factory Ratios Increased Power
