Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/25-20 | 285/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.61 (650.5) | 26.73 (679) | 1.12 (28.5) 4.4% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 80.46 (2043.61) | 83.98 (2133.14) | 3.53 (89.54) 4.4% |
| Sidewall Height inches (mm) | 2.81 (71.25) | 3.37 (85.5) | 0.56 (14.25) 20% |
| Revolutions per mile (km) | 787.5 (489.33) | 754.45 (468.79) | -33.05 (-20.54) -4.2% |
285/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.88 mph (33.6 km/h) |
| 25 mph (40.23 km/h) | 26.1 mph (42 km/h) |
| 30 mph (48.28 km/h) | 31.31 mph (50.4 km/h) |
| 35 mph (56.33 km/h) | 36.53 mph (58.79 km/h) |
| 40 mph (64.37 km/h) | 41.75 mph (67.19 km/h) |
| 45 mph (72.42 km/h) | 46.97 mph (75.59 km/h) |
| 50 mph (80.47 km/h) | 52.19 mph (83.99 km/h) |
| 55 mph (88.51 km/h) | 57.41 mph (92.39 km/h) |
| 60 mph (96.56 km/h) | 62.63 mph (100.79 km/h) |
| 65 mph (104.61 km/h) | 67.85 mph (109.19 km/h) |
| 70 mph (112.65 km/h) | 73.07 mph (117.59 km/h) |
| 75 mph (120.7 km/h) | 78.29 mph (125.99 km/h) |
| 80 mph (128.75 km/h) | 83.5 mph (134.39 km/h) |
| 85 mph (136.79 km/h) | 88.72 mph (142.79 km/h) |
| 90 mph (144.84 km/h) | 93.94 mph (151.19 km/h) |
| 95 mph (152.89 km/h) | 99.16 mph (159.59 km/h) |
| 100 mph (160.93 km/h) | 104.38 mph (167.99 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1920 | 2230 | 2402 | 2508 | 2623 | 2704 | 2794 | 2900 | 3047 | 3194 | 3358 | 3489 | 3725 | 3987 | 4191 | 4322 | 4395 | 4665 | 5041 | 5858 |
Better Fuel Economy Factory Ratios Increased Power
