Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-18 | 300/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.22 (742.2) | 28.63 (727.2) | -0.59 (-15) -2% |
| Width inches (mm) | 11.22 (285) | 11.81 (300) | 0.59 (15) 5.3% |
| Circum. inches (mm) | 91.8 (2331.69) | 89.94 (2284.57) | -1.86 (-47.12) -2% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 5.31 (135) | -0.3 (-7.5) -5.3% |
| Revolutions per mile (km) | 690.2 (428.87) | 704.44 (437.72) | 14.24 (8.85) 2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.6 mph (31.54 km/h) |
| 25 mph (40.23 km/h) | 24.49 mph (39.42 km/h) |
| 30 mph (48.28 km/h) | 29.39 mph (47.3 km/h) |
| 35 mph (56.33 km/h) | 34.29 mph (55.19 km/h) |
| 40 mph (64.37 km/h) | 39.19 mph (63.07 km/h) |
| 45 mph (72.42 km/h) | 44.09 mph (70.96 km/h) |
| 50 mph (80.47 km/h) | 48.99 mph (78.84 km/h) |
| 55 mph (88.51 km/h) | 53.89 mph (86.73 km/h) |
| 60 mph (96.56 km/h) | 58.79 mph (94.61 km/h) |
| 65 mph (104.61 km/h) | 63.69 mph (102.49 km/h) |
| 70 mph (112.65 km/h) | 68.59 mph (110.38 km/h) |
| 75 mph (120.7 km/h) | 73.48 mph (118.26 km/h) |
| 80 mph (128.75 km/h) | 78.38 mph (126.15 km/h) |
| 85 mph (136.79 km/h) | 83.28 mph (134.03 km/h) |
| 90 mph (144.84 km/h) | 88.18 mph (141.91 km/h) |
| 95 mph (152.89 km/h) | 93.08 mph (149.8 km/h) |
| 100 mph (160.93 km/h) | 97.98 mph (157.68 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1793 | 2083 | 2243 | 2342 | 2449 | 2525 | 2609 | 2708 | 2845 | 2983 | 3135 | 3257 | 3479 | 3723 | 3913 | 4035 | 4104 | 4356 | 4707 | 5470 |
Better Fuel Economy Factory Ratios Increased Power
