Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/30-21 | 285/20-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.26 (692.4) | 25.49 (647.4) | -1.77 (-45) -6.5% |
| Width inches (mm) | 10.43 (265) | 11.22 (285) | 0.79 (20) 7.5% |
| Circum. inches (mm) | 85.64 (2175.24) | 80.07 (2033.87) | -5.57 (-141.37) -6.5% |
| Sidewall Height inches (mm) | 3.13 (79.5) | 2.24 (57) | -0.89 (-22.5) -28.3% |
| Revolutions per mile (km) | 739.85 (459.72) | 791.27 (491.67) | 51.43 (31.95) 7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.7 mph (30.1 km/h) |
| 25 mph (40.23 km/h) | 23.38 mph (37.62 km/h) |
| 30 mph (48.28 km/h) | 28.05 mph (45.14 km/h) |
| 35 mph (56.33 km/h) | 32.73 mph (52.67 km/h) |
| 40 mph (64.37 km/h) | 37.4 mph (60.19 km/h) |
| 45 mph (72.42 km/h) | 42.08 mph (67.71 km/h) |
| 50 mph (80.47 km/h) | 46.75 mph (75.24 km/h) |
| 55 mph (88.51 km/h) | 51.43 mph (82.76 km/h) |
| 60 mph (96.56 km/h) | 56.1 mph (90.29 km/h) |
| 65 mph (104.61 km/h) | 60.78 mph (97.81 km/h) |
| 70 mph (112.65 km/h) | 65.45 mph (105.33 km/h) |
| 75 mph (120.7 km/h) | 70.13 mph (112.86 km/h) |
| 80 mph (128.75 km/h) | 74.8 mph (120.38 km/h) |
| 85 mph (136.79 km/h) | 79.48 mph (127.9 km/h) |
| 90 mph (144.84 km/h) | 84.15 mph (135.43 km/h) |
| 95 mph (152.89 km/h) | 88.83 mph (142.95 km/h) |
| 100 mph (160.93 km/h) | 93.5 mph (150.48 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2014 | 2339 | 2519 | 2631 | 2751 | 2836 | 2930 | 3042 | 3196 | 3350 | 3522 | 3659 | 3907 | 4182 | 4396 | 4533 | 4610 | 4893 | 5287 | 6144 |
Better Fuel Economy Factory Ratios Increased Power
