Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 230/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 23.43 (595.2) | -0.12 (-3) -0.5% |
| Width inches (mm) | 9.25 (235) | 9.06 (230) | -0.2 (-5) -2.1% |
| Circum. inches (mm) | 73.99 (1879.3) | 73.62 (1869.88) | -0.37 (-9.42) -0.5% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 2.72 (69) | -0.06 (-1.5) -2.1% |
| Revolutions per mile (km) | 856.35 (532.11) | 860.67 (534.79) | 4.32 (2.68) 0.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.9 mph (32.03 km/h) |
| 25 mph (40.23 km/h) | 24.87 mph (40.03 km/h) |
| 30 mph (48.28 km/h) | 29.85 mph (48.04 km/h) |
| 35 mph (56.33 km/h) | 34.82 mph (56.04 km/h) |
| 40 mph (64.37 km/h) | 39.8 mph (64.05 km/h) |
| 45 mph (72.42 km/h) | 44.77 mph (72.06 km/h) |
| 50 mph (80.47 km/h) | 49.75 mph (80.06 km/h) |
| 55 mph (88.51 km/h) | 54.72 mph (88.07 km/h) |
| 60 mph (96.56 km/h) | 59.7 mph (96.08 km/h) |
| 65 mph (104.61 km/h) | 64.67 mph (104.08 km/h) |
| 70 mph (112.65 km/h) | 69.65 mph (112.09 km/h) |
| 75 mph (120.7 km/h) | 74.62 mph (120.1 km/h) |
| 80 mph (128.75 km/h) | 79.6 mph (128.1 km/h) |
| 85 mph (136.79 km/h) | 84.57 mph (136.11 km/h) |
| 90 mph (144.84 km/h) | 89.55 mph (144.11 km/h) |
| 95 mph (152.89 km/h) | 94.52 mph (152.12 km/h) |
| 100 mph (160.93 km/h) | 99.5 mph (160.13 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2190 | 2544 | 2740 | 2861 | 2992 | 3085 | 3187 | 3309 | 3476 | 3644 | 3831 | 3980 | 4250 | 4548 | 4781 | 4930 | 5014 | 5322 | 5751 | 6683 |
Better Fuel Economy Factory Ratios Increased Power
