Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-18 | 305/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.81 (731.7) | 25.2 (640.2) | -3.6 (-91.5) -12.5% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 90.5 (2298.7) | 79.18 (2011.25) | -11.32 (-287.46) -12.5% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 3.6 (91.5) | -1.8 (-45.75) -33.3% |
| Revolutions per mile (km) | 700.11 (435.03) | 800.17 (497.2) | 100.06 (62.18) 14.3% |
305/30-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.5 mph (28.16 km/h) |
| 25 mph (40.23 km/h) | 21.87 mph (35.2 km/h) |
| 30 mph (48.28 km/h) | 26.25 mph (42.24 km/h) |
| 35 mph (56.33 km/h) | 30.62 mph (49.28 km/h) |
| 40 mph (64.37 km/h) | 35 mph (56.32 km/h) |
| 45 mph (72.42 km/h) | 39.37 mph (63.36 km/h) |
| 50 mph (80.47 km/h) | 43.75 mph (70.4 km/h) |
| 55 mph (88.51 km/h) | 48.12 mph (77.45 km/h) |
| 60 mph (96.56 km/h) | 52.5 mph (84.49 km/h) |
| 65 mph (104.61 km/h) | 56.87 mph (91.53 km/h) |
| 70 mph (112.65 km/h) | 61.25 mph (98.57 km/h) |
| 75 mph (120.7 km/h) | 65.62 mph (105.61 km/h) |
| 80 mph (128.75 km/h) | 70 mph (112.65 km/h) |
| 85 mph (136.79 km/h) | 74.37 mph (119.69 km/h) |
| 90 mph (144.84 km/h) | 78.75 mph (126.73 km/h) |
| 95 mph (152.89 km/h) | 83.12 mph (133.77 km/h) |
| 100 mph (160.93 km/h) | 87.49 mph (140.81 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2036 | 2366 | 2548 | 2660 | 2781 | 2868 | 2963 | 3076 | 3232 | 3388 | 3561 | 3700 | 3951 | 4229 | 4445 | 4584 | 4662 | 4948 | 5346 | 6213 |
Better Fuel Economy Factory Ratios Increased Power
