Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/30-21 | 255/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.79 (680.4) | 26.02 (660.9) | -0.77 (-19.5) -2.9% |
| Width inches (mm) | 9.65 (245) | 10.04 (255) | 0.39 (10) 4.1% |
| Circum. inches (mm) | 84.16 (2137.54) | 81.74 (2076.28) | -2.41 (-61.26) -2.9% |
| Sidewall Height inches (mm) | 2.89 (73.5) | 2.51 (63.75) | -0.38 (-9.75) -13.3% |
| Revolutions per mile (km) | 752.9 (467.83) | 775.11 (481.63) | 22.21 (13.8) 3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.43 mph (31.26 km/h) |
| 25 mph (40.23 km/h) | 24.28 mph (39.08 km/h) |
| 30 mph (48.28 km/h) | 29.14 mph (46.9 km/h) |
| 35 mph (56.33 km/h) | 34 mph (54.71 km/h) |
| 40 mph (64.37 km/h) | 38.85 mph (62.53 km/h) |
| 45 mph (72.42 km/h) | 43.71 mph (70.35 km/h) |
| 50 mph (80.47 km/h) | 48.57 mph (78.16 km/h) |
| 55 mph (88.51 km/h) | 53.42 mph (85.98 km/h) |
| 60 mph (96.56 km/h) | 58.28 mph (93.79 km/h) |
| 65 mph (104.61 km/h) | 63.14 mph (101.61 km/h) |
| 70 mph (112.65 km/h) | 67.99 mph (109.43 km/h) |
| 75 mph (120.7 km/h) | 72.85 mph (117.24 km/h) |
| 80 mph (128.75 km/h) | 77.71 mph (125.06 km/h) |
| 85 mph (136.79 km/h) | 82.56 mph (132.87 km/h) |
| 90 mph (144.84 km/h) | 87.42 mph (140.69 km/h) |
| 95 mph (152.89 km/h) | 92.28 mph (148.51 km/h) |
| 100 mph (160.93 km/h) | 97.13 mph (156.32 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1973 | 2291 | 2468 | 2577 | 2694 | 2778 | 2871 | 2980 | 3131 | 3282 | 3450 | 3584 | 3828 | 4096 | 4306 | 4440 | 4516 | 4793 | 5179 | 6018 |
Better Fuel Economy Factory Ratios Increased Power
