Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/25-20 | 275/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.61 (650.5) | 26.5 (673) | 0.89 (22.5) 3.5% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 80.46 (2043.61) | 83.24 (2114.29) | 2.78 (70.69) 3.5% |
| Sidewall Height inches (mm) | 2.81 (71.25) | 3.25 (82.5) | 0.44 (11.25) 15.8% |
| Revolutions per mile (km) | 787.5 (489.33) | 761.17 (472.97) | -26.33 (-16.36) -3.3% |
275/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.69 mph (33.3 km/h) |
| 25 mph (40.23 km/h) | 25.86 mph (41.63 km/h) |
| 30 mph (48.28 km/h) | 31.04 mph (49.95 km/h) |
| 35 mph (56.33 km/h) | 36.21 mph (58.28 km/h) |
| 40 mph (64.37 km/h) | 41.38 mph (66.6 km/h) |
| 45 mph (72.42 km/h) | 46.56 mph (74.93 km/h) |
| 50 mph (80.47 km/h) | 51.73 mph (83.25 km/h) |
| 55 mph (88.51 km/h) | 56.9 mph (91.58 km/h) |
| 60 mph (96.56 km/h) | 62.08 mph (99.9 km/h) |
| 65 mph (104.61 km/h) | 67.25 mph (108.23 km/h) |
| 70 mph (112.65 km/h) | 72.42 mph (116.55 km/h) |
| 75 mph (120.7 km/h) | 77.59 mph (124.88 km/h) |
| 80 mph (128.75 km/h) | 82.77 mph (133.2 km/h) |
| 85 mph (136.79 km/h) | 87.94 mph (141.53 km/h) |
| 90 mph (144.84 km/h) | 93.11 mph (149.85 km/h) |
| 95 mph (152.89 km/h) | 98.29 mph (158.18 km/h) |
| 100 mph (160.93 km/h) | 103.46 mph (166.5 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1937 | 2250 | 2423 | 2531 | 2646 | 2728 | 2819 | 2926 | 3075 | 3223 | 3388 | 3520 | 3759 | 4022 | 4229 | 4360 | 4435 | 4707 | 5086 | 5910 |
Better Fuel Economy Factory Ratios Increased Power
