Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/30-21 | 265/20-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.79 (680.4) | 25.17 (639.4) | -1.61 (-41) -6% |
| Width inches (mm) | 9.65 (245) | 10.43 (265) | 0.79 (20) 8.2% |
| Circum. inches (mm) | 84.16 (2137.54) | 79.08 (2008.73) | -5.07 (-128.81) -6% |
| Sidewall Height inches (mm) | 2.89 (73.5) | 2.09 (53) | -0.81 (-20.5) -27.9% |
| Revolutions per mile (km) | 752.9 (467.83) | 801.17 (497.82) | 48.28 (30) 6.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.79 mph (30.25 km/h) |
| 25 mph (40.23 km/h) | 23.49 mph (37.81 km/h) |
| 30 mph (48.28 km/h) | 28.19 mph (45.37 km/h) |
| 35 mph (56.33 km/h) | 32.89 mph (52.93 km/h) |
| 40 mph (64.37 km/h) | 37.59 mph (60.49 km/h) |
| 45 mph (72.42 km/h) | 42.29 mph (68.06 km/h) |
| 50 mph (80.47 km/h) | 46.99 mph (75.62 km/h) |
| 55 mph (88.51 km/h) | 51.69 mph (83.18 km/h) |
| 60 mph (96.56 km/h) | 56.38 mph (90.74 km/h) |
| 65 mph (104.61 km/h) | 61.08 mph (98.3 km/h) |
| 70 mph (112.65 km/h) | 65.78 mph (105.87 km/h) |
| 75 mph (120.7 km/h) | 70.48 mph (113.43 km/h) |
| 80 mph (128.75 km/h) | 75.18 mph (120.99 km/h) |
| 85 mph (136.79 km/h) | 79.88 mph (128.55 km/h) |
| 90 mph (144.84 km/h) | 84.58 mph (136.11 km/h) |
| 95 mph (152.89 km/h) | 89.28 mph (143.68 km/h) |
| 100 mph (160.93 km/h) | 93.97 mph (151.24 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2039 | 2369 | 2551 | 2663 | 2785 | 2872 | 2967 | 3080 | 3236 | 3392 | 3566 | 3705 | 3956 | 4234 | 4451 | 4590 | 4668 | 4954 | 5353 | 6221 |
Better Fuel Economy Factory Ratios Increased Power
