Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/30-18 | 305/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.73 (628.2) | 25.2 (640.2) | 0.47 (12) 1.9% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 77.7 (1973.55) | 79.18 (2011.25) | 1.48 (37.7) 1.9% |
| Sidewall Height inches (mm) | 3.37 (85.5) | 3.6 (91.5) | 0.24 (6) 7% |
| Revolutions per mile (km) | 815.46 (506.7) | 800.17 (497.2) | -15.29 (-9.5) -1.9% |
305/30-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.38 mph (32.8 km/h) |
| 25 mph (40.23 km/h) | 25.48 mph (41 km/h) |
| 30 mph (48.28 km/h) | 30.57 mph (49.2 km/h) |
| 35 mph (56.33 km/h) | 35.67 mph (57.4 km/h) |
| 40 mph (64.37 km/h) | 40.76 mph (65.6 km/h) |
| 45 mph (72.42 km/h) | 45.86 mph (73.8 km/h) |
| 50 mph (80.47 km/h) | 50.96 mph (82 km/h) |
| 55 mph (88.51 km/h) | 56.05 mph (90.2 km/h) |
| 60 mph (96.56 km/h) | 61.15 mph (98.41 km/h) |
| 65 mph (104.61 km/h) | 66.24 mph (106.61 km/h) |
| 70 mph (112.65 km/h) | 71.34 mph (114.81 km/h) |
| 75 mph (120.7 km/h) | 76.43 mph (123.01 km/h) |
| 80 mph (128.75 km/h) | 81.53 mph (131.21 km/h) |
| 85 mph (136.79 km/h) | 86.62 mph (139.41 km/h) |
| 90 mph (144.84 km/h) | 91.72 mph (147.61 km/h) |
| 95 mph (152.89 km/h) | 96.81 mph (155.81 km/h) |
| 100 mph (160.93 km/h) | 101.91 mph (164.01 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
