Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 235/25-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 22.63 (574.7) | -0.93 (-23.5) -3.9% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 73.99 (1879.3) | 71.08 (1805.47) | -2.91 (-73.83) -3.9% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 2.31 (58.75) | -0.46 (-11.75) -16.7% |
| Revolutions per mile (km) | 856.35 (532.11) | 891.37 (553.87) | 35.02 (21.76) 4.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.21 mph (30.92 km/h) |
| 25 mph (40.23 km/h) | 24.02 mph (38.65 km/h) |
| 30 mph (48.28 km/h) | 28.82 mph (46.38 km/h) |
| 35 mph (56.33 km/h) | 33.63 mph (54.11 km/h) |
| 40 mph (64.37 km/h) | 38.43 mph (61.84 km/h) |
| 45 mph (72.42 km/h) | 43.23 mph (69.58 km/h) |
| 50 mph (80.47 km/h) | 48.04 mph (77.31 km/h) |
| 55 mph (88.51 km/h) | 52.84 mph (85.04 km/h) |
| 60 mph (96.56 km/h) | 57.64 mph (92.77 km/h) |
| 65 mph (104.61 km/h) | 62.45 mph (100.5 km/h) |
| 70 mph (112.65 km/h) | 67.25 mph (108.23 km/h) |
| 75 mph (120.7 km/h) | 72.05 mph (115.96 km/h) |
| 80 mph (128.75 km/h) | 76.86 mph (123.69 km/h) |
| 85 mph (136.79 km/h) | 81.66 mph (131.42 km/h) |
| 90 mph (144.84 km/h) | 86.46 mph (139.15 km/h) |
| 95 mph (152.89 km/h) | 91.27 mph (146.88 km/h) |
| 100 mph (160.93 km/h) | 96.07 mph (154.61 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2268 | 2635 | 2838 | 2963 | 3098 | 3195 | 3301 | 3427 | 3600 | 3774 | 3967 | 4122 | 4402 | 4710 | 4952 | 5106 | 5193 | 5512 | 5956 | 6921 |
Better Fuel Economy Factory Ratios Increased Power
