Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/65-15 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.49 (647.5) | 25.09 (637.2) | -0.41 (-10.3) -1.6% |
| Width inches (mm) | 8.07 (205) | 8.86 (225) | 0.79 (20) 9.8% |
| Circum. inches (mm) | 80.09 (2034.18) | 78.81 (2001.82) | -1.27 (-32.36) -1.6% |
| Sidewall Height inches (mm) | 5.25 (133.25) | 3.54 (90) | -1.7 (-43.25) -32.5% |
| Revolutions per mile (km) | 791.15 (491.6) | 803.94 (499.54) | 12.79 (7.95) 1.6% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.68 mph (31.67 km/h) |
| 25 mph (40.23 km/h) | 24.6 mph (39.59 km/h) |
| 30 mph (48.28 km/h) | 29.52 mph (47.51 km/h) |
| 35 mph (56.33 km/h) | 34.44 mph (55.43 km/h) |
| 40 mph (64.37 km/h) | 39.36 mph (63.35 km/h) |
| 45 mph (72.42 km/h) | 44.28 mph (71.27 km/h) |
| 50 mph (80.47 km/h) | 49.2 mph (79.19 km/h) |
| 55 mph (88.51 km/h) | 54.13 mph (87.11 km/h) |
| 60 mph (96.56 km/h) | 59.05 mph (95.02 km/h) |
| 65 mph (104.61 km/h) | 63.97 mph (102.94 km/h) |
| 70 mph (112.65 km/h) | 68.89 mph (110.86 km/h) |
| 75 mph (120.7 km/h) | 73.81 mph (118.78 km/h) |
| 80 mph (128.75 km/h) | 78.73 mph (126.7 km/h) |
| 85 mph (136.79 km/h) | 83.65 mph (134.62 km/h) |
| 90 mph (144.84 km/h) | 88.57 mph (142.54 km/h) |
| 95 mph (152.89 km/h) | 93.49 mph (150.46 km/h) |
| 100 mph (160.93 km/h) | 98.41 mph (158.37 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
