Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-17 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.5 (647.8) | 25.09 (637.2) | -0.42 (-10.6) -1.6% |
| Width inches (mm) | 5.31 (135) | 8.86 (225) | 3.54 (90) 66.7% |
| Circum. inches (mm) | 80.12 (2035.12) | 78.81 (2001.82) | -1.31 (-33.3) -1.6% |
| Sidewall Height inches (mm) | 4.25 (108) | 3.54 (90) | -0.71 (-18) -16.7% |
| Revolutions per mile (km) | 790.78 (491.37) | 803.94 (499.54) | 13.15 (8.17) 1.7% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.67 mph (31.66 km/h) |
| 25 mph (40.23 km/h) | 24.59 mph (39.58 km/h) |
| 30 mph (48.28 km/h) | 29.51 mph (47.49 km/h) |
| 35 mph (56.33 km/h) | 34.43 mph (55.41 km/h) |
| 40 mph (64.37 km/h) | 39.35 mph (63.32 km/h) |
| 45 mph (72.42 km/h) | 44.26 mph (71.24 km/h) |
| 50 mph (80.47 km/h) | 49.18 mph (79.15 km/h) |
| 55 mph (88.51 km/h) | 54.1 mph (87.07 km/h) |
| 60 mph (96.56 km/h) | 59.02 mph (94.98 km/h) |
| 65 mph (104.61 km/h) | 63.94 mph (102.9 km/h) |
| 70 mph (112.65 km/h) | 68.85 mph (110.81 km/h) |
| 75 mph (120.7 km/h) | 73.77 mph (118.73 km/h) |
| 80 mph (128.75 km/h) | 78.69 mph (126.64 km/h) |
| 85 mph (136.79 km/h) | 83.61 mph (134.56 km/h) |
| 90 mph (144.84 km/h) | 88.53 mph (142.47 km/h) |
| 95 mph (152.89 km/h) | 93.45 mph (150.39 km/h) |
| 100 mph (160.93 km/h) | 98.36 mph (158.3 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
