Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 125/80-17 | 235/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.87 (631.8) | 26.33 (668.7) | 1.45 (36.9) 5.8% |
| Width inches (mm) | 4.92 (125) | 9.25 (235) | 4.33 (110) 88% |
| Circum. inches (mm) | 78.14 (1984.86) | 82.71 (2100.78) | 4.56 (115.92) 5.8% |
| Sidewall Height inches (mm) | 3.94 (100) | 4.16 (105.75) | 0.23 (5.75) 5.8% |
| Revolutions per mile (km) | 810.81 (503.81) | 766.07 (476.01) | -44.74 (-27.8) -5.5% |
235/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.17 mph (34.07 km/h) |
| 25 mph (40.23 km/h) | 26.46 mph (42.58 km/h) |
| 30 mph (48.28 km/h) | 31.75 mph (51.1 km/h) |
| 35 mph (56.33 km/h) | 37.04 mph (59.62 km/h) |
| 40 mph (64.37 km/h) | 42.34 mph (68.13 km/h) |
| 45 mph (72.42 km/h) | 47.63 mph (76.65 km/h) |
| 50 mph (80.47 km/h) | 52.92 mph (85.17 km/h) |
| 55 mph (88.51 km/h) | 58.21 mph (93.68 km/h) |
| 60 mph (96.56 km/h) | 63.5 mph (102.2 km/h) |
| 65 mph (104.61 km/h) | 68.8 mph (110.72 km/h) |
| 70 mph (112.65 km/h) | 74.09 mph (119.23 km/h) |
| 75 mph (120.7 km/h) | 79.38 mph (127.75 km/h) |
| 80 mph (128.75 km/h) | 84.67 mph (136.27 km/h) |
| 85 mph (136.79 km/h) | 89.96 mph (144.78 km/h) |
| 90 mph (144.84 km/h) | 95.26 mph (153.3 km/h) |
| 95 mph (152.89 km/h) | 100.55 mph (161.82 km/h) |
| 100 mph (160.93 km/h) | 105.84 mph (170.33 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
