Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/45-18 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.62 (650.7) | 25.09 (637.2) | -0.53 (-13.5) -2.1% |
| Width inches (mm) | 8.46 (215) | 8.86 (225) | 0.39 (10) 4.7% |
| Circum. inches (mm) | 80.48 (2044.23) | 78.81 (2001.82) | -1.67 (-42.41) -2.1% |
| Sidewall Height inches (mm) | 3.81 (96.75) | 3.54 (90) | -0.27 (-6.75) -7% |
| Revolutions per mile (km) | 787.26 (489.18) | 803.94 (499.54) | 16.68 (10.36) 2.1% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.59 mph (31.52 km/h) |
| 25 mph (40.23 km/h) | 24.48 mph (39.4 km/h) |
| 30 mph (48.28 km/h) | 29.38 mph (47.28 km/h) |
| 35 mph (56.33 km/h) | 34.27 mph (55.16 km/h) |
| 40 mph (64.37 km/h) | 39.17 mph (63.04 km/h) |
| 45 mph (72.42 km/h) | 44.07 mph (70.92 km/h) |
| 50 mph (80.47 km/h) | 48.96 mph (78.8 km/h) |
| 55 mph (88.51 km/h) | 53.86 mph (86.68 km/h) |
| 60 mph (96.56 km/h) | 58.76 mph (94.56 km/h) |
| 65 mph (104.61 km/h) | 63.65 mph (102.44 km/h) |
| 70 mph (112.65 km/h) | 68.55 mph (110.32 km/h) |
| 75 mph (120.7 km/h) | 73.44 mph (118.2 km/h) |
| 80 mph (128.75 km/h) | 78.34 mph (126.08 km/h) |
| 85 mph (136.79 km/h) | 83.24 mph (133.96 km/h) |
| 90 mph (144.84 km/h) | 88.13 mph (141.84 km/h) |
| 95 mph (152.89 km/h) | 93.03 mph (149.72 km/h) |
| 100 mph (160.93 km/h) | 97.93 mph (157.6 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
