Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/40-18 | 235/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.09 (637.2) | 25.4 (645.2) | 0.31 (8) 1.3% |
| Width inches (mm) | 8.86 (225) | 9.25 (235) | 0.39 (10) 4.4% |
| Circum. inches (mm) | 78.81 (2001.82) | 79.8 (2026.96) | 0.99 (25.13) 1.3% |
| Sidewall Height inches (mm) | 3.54 (90) | 3.7 (94) | 0.16 (4) 4.4% |
| Revolutions per mile (km) | 803.94 (499.54) | 793.97 (493.35) | -9.97 (-6.19) -1.2% |
235/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.25 mph (32.59 km/h) |
| 25 mph (40.23 km/h) | 25.31 mph (40.74 km/h) |
| 30 mph (48.28 km/h) | 30.38 mph (48.89 km/h) |
| 35 mph (56.33 km/h) | 35.44 mph (57.03 km/h) |
| 40 mph (64.37 km/h) | 40.5 mph (65.18 km/h) |
| 45 mph (72.42 km/h) | 45.56 mph (73.33 km/h) |
| 50 mph (80.47 km/h) | 50.63 mph (81.48 km/h) |
| 55 mph (88.51 km/h) | 55.69 mph (89.63 km/h) |
| 60 mph (96.56 km/h) | 60.75 mph (97.77 km/h) |
| 65 mph (104.61 km/h) | 65.82 mph (105.92 km/h) |
| 70 mph (112.65 km/h) | 70.88 mph (114.07 km/h) |
| 75 mph (120.7 km/h) | 75.94 mph (122.22 km/h) |
| 80 mph (128.75 km/h) | 81 mph (130.36 km/h) |
| 85 mph (136.79 km/h) | 86.07 mph (138.51 km/h) |
| 90 mph (144.84 km/h) | 91.13 mph (146.66 km/h) |
| 95 mph (152.89 km/h) | 96.19 mph (154.81 km/h) |
| 100 mph (160.93 km/h) | 101.26 mph (162.96 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
