Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/45-18 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.68 (677.7) | 25.09 (637.2) | -1.59 (-40.5) -6% |
| Width inches (mm) | 9.65 (245) | 8.86 (225) | -0.79 (-20) -8.2% |
| Circum. inches (mm) | 83.82 (2129.06) | 78.81 (2001.82) | -5.01 (-127.23) -6% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 3.54 (90) | -0.8 (-20.25) -18.4% |
| Revolutions per mile (km) | 755.9 (469.69) | 803.94 (499.54) | 48.04 (29.85) 6.4% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.8 mph (30.26 km/h) |
| 25 mph (40.23 km/h) | 23.51 mph (37.83 km/h) |
| 30 mph (48.28 km/h) | 28.21 mph (45.4 km/h) |
| 35 mph (56.33 km/h) | 32.91 mph (52.96 km/h) |
| 40 mph (64.37 km/h) | 37.61 mph (60.53 km/h) |
| 45 mph (72.42 km/h) | 42.31 mph (68.09 km/h) |
| 50 mph (80.47 km/h) | 47.01 mph (75.66 km/h) |
| 55 mph (88.51 km/h) | 51.71 mph (83.22 km/h) |
| 60 mph (96.56 km/h) | 56.41 mph (90.79 km/h) |
| 65 mph (104.61 km/h) | 61.12 mph (98.36 km/h) |
| 70 mph (112.65 km/h) | 65.82 mph (105.92 km/h) |
| 75 mph (120.7 km/h) | 70.52 mph (113.49 km/h) |
| 80 mph (128.75 km/h) | 75.22 mph (121.05 km/h) |
| 85 mph (136.79 km/h) | 79.92 mph (128.62 km/h) |
| 90 mph (144.84 km/h) | 84.62 mph (136.19 km/h) |
| 95 mph (152.89 km/h) | 89.32 mph (143.75 km/h) |
| 100 mph (160.93 km/h) | 94.02 mph (151.32 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
