Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 270/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 24.38 (619.2) | 0.83 (21) 3.5% |
| Width inches (mm) | 9.25 (235) | 10.63 (270) | 1.38 (35) 14.9% |
| Circum. inches (mm) | 73.99 (1879.3) | 76.59 (1945.27) | 2.6 (65.97) 3.5% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 3.19 (81) | 0.41 (10.5) 14.9% |
| Revolutions per mile (km) | 856.35 (532.11) | 827.31 (514.07) | -29.04 (-18.05) -3.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.7 mph (33.32 km/h) |
| 25 mph (40.23 km/h) | 25.88 mph (41.65 km/h) |
| 30 mph (48.28 km/h) | 31.05 mph (49.98 km/h) |
| 35 mph (56.33 km/h) | 36.23 mph (58.3 km/h) |
| 40 mph (64.37 km/h) | 41.4 mph (66.63 km/h) |
| 45 mph (72.42 km/h) | 46.58 mph (74.96 km/h) |
| 50 mph (80.47 km/h) | 51.76 mph (83.29 km/h) |
| 55 mph (88.51 km/h) | 56.93 mph (91.62 km/h) |
| 60 mph (96.56 km/h) | 62.11 mph (99.95 km/h) |
| 65 mph (104.61 km/h) | 67.28 mph (108.28 km/h) |
| 70 mph (112.65 km/h) | 72.46 mph (116.61 km/h) |
| 75 mph (120.7 km/h) | 77.63 mph (124.94 km/h) |
| 80 mph (128.75 km/h) | 82.81 mph (133.27 km/h) |
| 85 mph (136.79 km/h) | 87.98 mph (141.6 km/h) |
| 90 mph (144.84 km/h) | 93.16 mph (149.93 km/h) |
| 95 mph (152.89 km/h) | 98.34 mph (158.26 km/h) |
| 100 mph (160.93 km/h) | 103.51 mph (166.58 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2105 | 2446 | 2634 | 2750 | 2876 | 2965 | 3064 | 3180 | 3342 | 3503 | 3682 | 3825 | 4085 | 4372 | 4596 | 4739 | 4820 | 5116 | 5528 | 6424 |
Better Fuel Economy Factory Ratios Increased Power
