Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/55-18 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.31 (693.7) | 25.09 (637.2) | -2.22 (-56.5) -8.1% |
| Width inches (mm) | 8.46 (215) | 8.86 (225) | 0.39 (10) 4.7% |
| Circum. inches (mm) | 85.8 (2179.32) | 78.81 (2001.82) | -6.99 (-177.5) -8.1% |
| Sidewall Height inches (mm) | 4.66 (118.25) | 3.54 (90) | -1.11 (-28.25) -23.9% |
| Revolutions per mile (km) | 738.46 (458.86) | 803.94 (499.54) | 65.48 (40.69) 8.9% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.37 mph (29.57 km/h) |
| 25 mph (40.23 km/h) | 22.96 mph (36.96 km/h) |
| 30 mph (48.28 km/h) | 27.56 mph (44.35 km/h) |
| 35 mph (56.33 km/h) | 32.15 mph (51.74 km/h) |
| 40 mph (64.37 km/h) | 36.74 mph (59.13 km/h) |
| 45 mph (72.42 km/h) | 41.33 mph (66.52 km/h) |
| 50 mph (80.47 km/h) | 45.93 mph (73.91 km/h) |
| 55 mph (88.51 km/h) | 50.52 mph (81.3 km/h) |
| 60 mph (96.56 km/h) | 55.11 mph (88.7 km/h) |
| 65 mph (104.61 km/h) | 59.71 mph (96.09 km/h) |
| 70 mph (112.65 km/h) | 64.3 mph (103.48 km/h) |
| 75 mph (120.7 km/h) | 68.89 mph (110.87 km/h) |
| 80 mph (128.75 km/h) | 73.48 mph (118.26 km/h) |
| 85 mph (136.79 km/h) | 78.08 mph (125.65 km/h) |
| 90 mph (144.84 km/h) | 82.67 mph (133.04 km/h) |
| 95 mph (152.89 km/h) | 87.26 mph (140.44 km/h) |
| 100 mph (160.93 km/h) | 91.86 mph (147.83 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
