Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-16 | 235/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.5 (622.4) | 26.33 (668.7) | 1.82 (46.3) 7.4% |
| Width inches (mm) | 5.31 (135) | 9.25 (235) | 3.94 (100) 74.1% |
| Circum. inches (mm) | 76.98 (1955.33) | 82.71 (2100.78) | 5.73 (145.46) 7.4% |
| Sidewall Height inches (mm) | 4.25 (108) | 4.16 (105.75) | -0.09 (-2.25) -2.1% |
| Revolutions per mile (km) | 823.06 (511.42) | 766.07 (476.01) | -56.99 (-35.41) -6.9% |
235/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.49 mph (34.58 km/h) |
| 25 mph (40.23 km/h) | 26.86 mph (43.23 km/h) |
| 30 mph (48.28 km/h) | 32.23 mph (51.87 km/h) |
| 35 mph (56.33 km/h) | 37.6 mph (60.52 km/h) |
| 40 mph (64.37 km/h) | 42.98 mph (69.16 km/h) |
| 45 mph (72.42 km/h) | 48.35 mph (77.81 km/h) |
| 50 mph (80.47 km/h) | 53.72 mph (86.45 km/h) |
| 55 mph (88.51 km/h) | 59.09 mph (95.1 km/h) |
| 60 mph (96.56 km/h) | 64.46 mph (103.74 km/h) |
| 65 mph (104.61 km/h) | 69.84 mph (112.39 km/h) |
| 70 mph (112.65 km/h) | 75.21 mph (121.03 km/h) |
| 75 mph (120.7 km/h) | 80.58 mph (129.68 km/h) |
| 80 mph (128.75 km/h) | 85.95 mph (138.33 km/h) |
| 85 mph (136.79 km/h) | 91.32 mph (146.97 km/h) |
| 90 mph (144.84 km/h) | 96.7 mph (155.62 km/h) |
| 95 mph (152.89 km/h) | 102.07 mph (164.26 km/h) |
| 100 mph (160.93 km/h) | 107.44 mph (172.91 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1949 | 2265 | 2439 | 2547 | 2663 | 2746 | 2837 | 2945 | 3094 | 3244 | 3410 | 3542 | 3783 | 4048 | 4256 | 4388 | 4463 | 4737 | 5118 | 5948 |
Better Fuel Economy Factory Ratios Increased Power
