Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/75-15 | 235/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.88 (733.5) | 26.33 (668.7) | -2.55 (-64.8) -8.8% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 90.72 (2304.36) | 82.71 (2100.78) | -8.01 (-203.58) -8.8% |
| Sidewall Height inches (mm) | 6.94 (176.25) | 4.16 (105.75) | -2.78 (-70.5) -40% |
| Revolutions per mile (km) | 698.39 (433.96) | 766.07 (476.01) | 67.68 (42.05) 9.7% |
235/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.23 mph (29.34 km/h) |
| 25 mph (40.23 km/h) | 22.79 mph (36.68 km/h) |
| 30 mph (48.28 km/h) | 27.35 mph (44.02 km/h) |
| 35 mph (56.33 km/h) | 31.91 mph (51.35 km/h) |
| 40 mph (64.37 km/h) | 36.47 mph (58.69 km/h) |
| 45 mph (72.42 km/h) | 41.02 mph (66.02 km/h) |
| 50 mph (80.47 km/h) | 45.58 mph (73.36 km/h) |
| 55 mph (88.51 km/h) | 50.14 mph (80.69 km/h) |
| 60 mph (96.56 km/h) | 54.7 mph (88.03 km/h) |
| 65 mph (104.61 km/h) | 59.26 mph (95.37 km/h) |
| 70 mph (112.65 km/h) | 63.82 mph (102.7 km/h) |
| 75 mph (120.7 km/h) | 68.37 mph (110.04 km/h) |
| 80 mph (128.75 km/h) | 72.93 mph (117.37 km/h) |
| 85 mph (136.79 km/h) | 77.49 mph (124.71 km/h) |
| 90 mph (144.84 km/h) | 82.05 mph (132.05 km/h) |
| 95 mph (152.89 km/h) | 86.61 mph (139.38 km/h) |
| 100 mph (160.93 km/h) | 91.17 mph (146.72 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
