Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/45-15 | 235/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.68 (601.5) | 25.4 (645.2) | 1.72 (43.7) 7.3% |
| Width inches (mm) | 9.65 (245) | 9.25 (235) | -0.39 (-10) -4.1% |
| Circum. inches (mm) | 74.4 (1889.67) | 79.8 (2026.96) | 5.41 (137.29) 7.3% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 3.7 (94) | -0.64 (-16.25) -14.7% |
| Revolutions per mile (km) | 851.65 (529.19) | 793.97 (493.35) | -57.68 (-35.84) -6.8% |
235/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.45 mph (34.53 km/h) |
| 25 mph (40.23 km/h) | 26.82 mph (43.16 km/h) |
| 30 mph (48.28 km/h) | 32.18 mph (51.79 km/h) |
| 35 mph (56.33 km/h) | 37.54 mph (60.42 km/h) |
| 40 mph (64.37 km/h) | 42.91 mph (69.05 km/h) |
| 45 mph (72.42 km/h) | 48.27 mph (77.68 km/h) |
| 50 mph (80.47 km/h) | 53.63 mph (86.31 km/h) |
| 55 mph (88.51 km/h) | 59 mph (94.94 km/h) |
| 60 mph (96.56 km/h) | 64.36 mph (103.58 km/h) |
| 65 mph (104.61 km/h) | 69.72 mph (112.21 km/h) |
| 70 mph (112.65 km/h) | 75.09 mph (120.84 km/h) |
| 75 mph (120.7 km/h) | 80.45 mph (129.47 km/h) |
| 80 mph (128.75 km/h) | 85.81 mph (138.1 km/h) |
| 85 mph (136.79 km/h) | 91.18 mph (146.73 km/h) |
| 90 mph (144.84 km/h) | 96.54 mph (155.36 km/h) |
| 95 mph (152.89 km/h) | 101.9 mph (164 km/h) |
| 100 mph (160.93 km/h) | 107.27 mph (172.63 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | 2347 | 2528 | 2640 | 2760 | 2846 | 2940 | 3052 | 3207 | 3362 | 3534 | 3671 | 3921 | 4196 | 4411 | 4548 | 4626 | 4909 | 5305 | 6165 |
Better Fuel Economy Factory Ratios Increased Power
