Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/40-17 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.77 (603.8) | 25.09 (637.2) | 1.31 (33.4) 5.5% |
| Width inches (mm) | 8.46 (215) | 8.86 (225) | 0.39 (10) 4.7% |
| Circum. inches (mm) | 74.68 (1896.89) | 78.81 (2001.82) | 4.13 (104.93) 5.5% |
| Sidewall Height inches (mm) | 3.39 (86) | 3.54 (90) | 0.16 (4) 4.7% |
| Revolutions per mile (km) | 848.41 (527.18) | 803.94 (499.54) | -44.47 (-27.63) -5.2% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.11 mph (33.97 km/h) |
| 25 mph (40.23 km/h) | 26.38 mph (42.46 km/h) |
| 30 mph (48.28 km/h) | 31.66 mph (50.95 km/h) |
| 35 mph (56.33 km/h) | 36.94 mph (59.44 km/h) |
| 40 mph (64.37 km/h) | 42.21 mph (67.93 km/h) |
| 45 mph (72.42 km/h) | 47.49 mph (76.43 km/h) |
| 50 mph (80.47 km/h) | 52.77 mph (84.92 km/h) |
| 55 mph (88.51 km/h) | 58.04 mph (93.41 km/h) |
| 60 mph (96.56 km/h) | 63.32 mph (101.9 km/h) |
| 65 mph (104.61 km/h) | 68.6 mph (110.39 km/h) |
| 70 mph (112.65 km/h) | 73.87 mph (118.89 km/h) |
| 75 mph (120.7 km/h) | 79.15 mph (127.38 km/h) |
| 80 mph (128.75 km/h) | 84.43 mph (135.87 km/h) |
| 85 mph (136.79 km/h) | 89.7 mph (144.36 km/h) |
| 90 mph (144.84 km/h) | 94.98 mph (152.85 km/h) |
| 95 mph (152.89 km/h) | 100.26 mph (161.35 km/h) |
| 100 mph (160.93 km/h) | 105.53 mph (169.84 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
