Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/70-17 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.44 (620.8) | 25.09 (637.2) | 0.65 (16.4) 2.6% |
| Width inches (mm) | 5.31 (135) | 8.86 (225) | 3.54 (90) 66.7% |
| Circum. inches (mm) | 76.78 (1950.3) | 78.81 (2001.82) | 2.03 (51.52) 2.6% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 3.54 (90) | -0.18 (-4.5) -4.8% |
| Revolutions per mile (km) | 825.18 (512.74) | 803.94 (499.54) | -21.24 (-13.2) -2.6% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.53 mph (33.04 km/h) |
| 25 mph (40.23 km/h) | 25.66 mph (41.3 km/h) |
| 30 mph (48.28 km/h) | 30.79 mph (49.56 km/h) |
| 35 mph (56.33 km/h) | 35.92 mph (57.82 km/h) |
| 40 mph (64.37 km/h) | 41.06 mph (66.07 km/h) |
| 45 mph (72.42 km/h) | 46.19 mph (74.33 km/h) |
| 50 mph (80.47 km/h) | 51.32 mph (82.59 km/h) |
| 55 mph (88.51 km/h) | 56.45 mph (90.85 km/h) |
| 60 mph (96.56 km/h) | 61.59 mph (99.11 km/h) |
| 65 mph (104.61 km/h) | 66.72 mph (107.37 km/h) |
| 70 mph (112.65 km/h) | 71.85 mph (115.63 km/h) |
| 75 mph (120.7 km/h) | 76.98 mph (123.89 km/h) |
| 80 mph (128.75 km/h) | 82.11 mph (132.15 km/h) |
| 85 mph (136.79 km/h) | 87.25 mph (140.41 km/h) |
| 90 mph (144.84 km/h) | 92.38 mph (148.67 km/h) |
| 95 mph (152.89 km/h) | 97.51 mph (156.93 km/h) |
| 100 mph (160.93 km/h) | 102.64 mph (165.19 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
