Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-18 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.33 (668.7) | 28.18 (715.7) | 1.85 (47) 7% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 82.71 (2100.78) | 88.52 (2248.44) | 5.81 (147.65) 7% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 5.09 (129.25) | 0.93 (23.5) 22.2% |
| Revolutions per mile (km) | 766.07 (476.01) | 715.76 (444.75) | -50.31 (-31.26) -6.6% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.41 mph (34.45 km/h) |
| 25 mph (40.23 km/h) | 26.76 mph (43.06 km/h) |
| 30 mph (48.28 km/h) | 32.11 mph (51.67 km/h) |
| 35 mph (56.33 km/h) | 37.46 mph (60.29 km/h) |
| 40 mph (64.37 km/h) | 42.81 mph (68.9 km/h) |
| 45 mph (72.42 km/h) | 48.16 mph (77.51 km/h) |
| 50 mph (80.47 km/h) | 53.51 mph (86.12 km/h) |
| 55 mph (88.51 km/h) | 58.87 mph (94.74 km/h) |
| 60 mph (96.56 km/h) | 64.22 mph (103.35 km/h) |
| 65 mph (104.61 km/h) | 69.57 mph (111.96 km/h) |
| 70 mph (112.65 km/h) | 74.92 mph (120.57 km/h) |
| 75 mph (120.7 km/h) | 80.27 mph (129.18 km/h) |
| 80 mph (128.75 km/h) | 85.62 mph (137.8 km/h) |
| 85 mph (136.79 km/h) | 90.97 mph (146.41 km/h) |
| 90 mph (144.84 km/h) | 96.33 mph (155.02 km/h) |
| 95 mph (152.89 km/h) | 101.68 mph (163.63 km/h) |
| 100 mph (160.93 km/h) | 107.03 mph (172.25 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1821 | 2116 | 2279 | 2380 | 2488 | 2566 | 2651 | 2752 | 2891 | 3031 | 3186 | 3310 | 3534 | 3782 | 3976 | 4100 | 4170 | 4426 | 4782 | 5557 |
Better Fuel Economy Factory Ratios Increased Power
