Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 250/40-18 | 230/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.87 (657.2) | 25.24 (641.2) | -0.63 (-16) -2.4% |
| Width inches (mm) | 9.84 (250) | 9.06 (230) | -0.79 (-20) -8% |
| Circum. inches (mm) | 81.29 (2064.65) | 79.31 (2014.39) | -1.98 (-50.27) -2.4% |
| Sidewall Height inches (mm) | 3.94 (100) | 3.62 (92) | -0.31 (-8) -8% |
| Revolutions per mile (km) | 779.47 (484.34) | 798.92 (496.43) | 19.45 (12.09) 2.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.51 mph (31.4 km/h) |
| 25 mph (40.23 km/h) | 24.39 mph (39.25 km/h) |
| 30 mph (48.28 km/h) | 29.27 mph (47.1 km/h) |
| 35 mph (56.33 km/h) | 34.15 mph (54.96 km/h) |
| 40 mph (64.37 km/h) | 39.03 mph (62.81 km/h) |
| 45 mph (72.42 km/h) | 43.9 mph (70.66 km/h) |
| 50 mph (80.47 km/h) | 48.78 mph (78.51 km/h) |
| 55 mph (88.51 km/h) | 53.66 mph (86.36 km/h) |
| 60 mph (96.56 km/h) | 58.54 mph (94.21 km/h) |
| 65 mph (104.61 km/h) | 63.42 mph (102.06 km/h) |
| 70 mph (112.65 km/h) | 68.3 mph (109.91 km/h) |
| 75 mph (120.7 km/h) | 73.17 mph (117.76 km/h) |
| 80 mph (128.75 km/h) | 78.05 mph (125.61 km/h) |
| 85 mph (136.79 km/h) | 82.93 mph (133.46 km/h) |
| 90 mph (144.84 km/h) | 87.81 mph (141.31 km/h) |
| 95 mph (152.89 km/h) | 92.69 mph (149.17 km/h) |
| 100 mph (160.93 km/h) | 97.57 mph (157.02 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2033 | 2362 | 2544 | 2656 | 2777 | 2864 | 2959 | 3071 | 3227 | 3383 | 3556 | 3694 | 3945 | 4222 | 4438 | 4577 | 4655 | 4940 | 5338 | 6203 |
Better Fuel Economy Factory Ratios Increased Power
