Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 225/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 23.31 (592.2) | -0.24 (-6) -1% |
| Width inches (mm) | 9.25 (235) | 8.86 (225) | -0.39 (-10) -4.3% |
| Circum. inches (mm) | 73.99 (1879.3) | 73.25 (1860.45) | -0.74 (-18.85) -1% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 2.66 (67.5) | -0.12 (-3) -4.3% |
| Revolutions per mile (km) | 856.35 (532.11) | 865.03 (537.5) | 8.68 (5.39) 1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.8 mph (31.86 km/h) |
| 25 mph (40.23 km/h) | 24.75 mph (39.83 km/h) |
| 30 mph (48.28 km/h) | 29.7 mph (47.8 km/h) |
| 35 mph (56.33 km/h) | 34.65 mph (55.76 km/h) |
| 40 mph (64.37 km/h) | 39.6 mph (63.73 km/h) |
| 45 mph (72.42 km/h) | 44.55 mph (71.69 km/h) |
| 50 mph (80.47 km/h) | 49.5 mph (79.66 km/h) |
| 55 mph (88.51 km/h) | 54.45 mph (87.63 km/h) |
| 60 mph (96.56 km/h) | 59.4 mph (95.59 km/h) |
| 65 mph (104.61 km/h) | 64.35 mph (103.56 km/h) |
| 70 mph (112.65 km/h) | 69.3 mph (111.52 km/h) |
| 75 mph (120.7 km/h) | 74.25 mph (119.49 km/h) |
| 80 mph (128.75 km/h) | 79.2 mph (127.46 km/h) |
| 85 mph (136.79 km/h) | 84.15 mph (135.42 km/h) |
| 90 mph (144.84 km/h) | 89.1 mph (143.39 km/h) |
| 95 mph (152.89 km/h) | 94.05 mph (151.35 km/h) |
| 100 mph (160.93 km/h) | 99 mph (159.32 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2201 | 2557 | 2754 | 2876 | 3007 | 3101 | 3204 | 3325 | 3494 | 3663 | 3850 | 4000 | 4272 | 4571 | 4805 | 4955 | 5040 | 5349 | 5780 | 6716 |
Better Fuel Economy Factory Ratios Increased Power
