Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 235/20-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 21.7 (551.2) | -1.85 (-47) -7.9% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 73.99 (1879.3) | 68.18 (1731.65) | -5.81 (-147.65) -7.9% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 1.85 (47) | -0.93 (-23.5) -33.3% |
| Revolutions per mile (km) | 856.35 (532.11) | 929.37 (577.48) | 73.02 (45.37) 8.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.43 mph (29.66 km/h) |
| 25 mph (40.23 km/h) | 23.04 mph (37.07 km/h) |
| 30 mph (48.28 km/h) | 27.64 mph (44.49 km/h) |
| 35 mph (56.33 km/h) | 32.25 mph (51.9 km/h) |
| 40 mph (64.37 km/h) | 36.86 mph (59.32 km/h) |
| 45 mph (72.42 km/h) | 41.46 mph (66.73 km/h) |
| 50 mph (80.47 km/h) | 46.07 mph (74.15 km/h) |
| 55 mph (88.51 km/h) | 50.68 mph (81.56 km/h) |
| 60 mph (96.56 km/h) | 55.29 mph (88.97 km/h) |
| 65 mph (104.61 km/h) | 59.89 mph (96.39 km/h) |
| 70 mph (112.65 km/h) | 64.5 mph (103.8 km/h) |
| 75 mph (120.7 km/h) | 69.11 mph (111.22 km/h) |
| 80 mph (128.75 km/h) | 73.71 mph (118.63 km/h) |
| 85 mph (136.79 km/h) | 78.32 mph (126.05 km/h) |
| 90 mph (144.84 km/h) | 82.93 mph (133.46 km/h) |
| 95 mph (152.89 km/h) | 87.54 mph (140.88 km/h) |
| 100 mph (160.93 km/h) | 92.14 mph (148.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
