Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-21 | 225/50-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.72 (729.4) | 29.86 (758.4) | 1.14 (29) 4% |
| Width inches (mm) | 9.65 (245) | 8.86 (225) | -0.79 (-20) -8.2% |
| Circum. inches (mm) | 90.22 (2291.48) | 93.8 (2382.58) | 3.59 (91.11) 4% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.43 (112.5) | 0.57 (14.5) 14.8% |
| Revolutions per mile (km) | 702.32 (436.4) | 675.46 (419.71) | -26.86 (-16.69) -3.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.8 mph (33.47 km/h) |
| 25 mph (40.23 km/h) | 25.99 mph (41.83 km/h) |
| 30 mph (48.28 km/h) | 31.19 mph (50.2 km/h) |
| 35 mph (56.33 km/h) | 36.39 mph (58.57 km/h) |
| 40 mph (64.37 km/h) | 41.59 mph (66.93 km/h) |
| 45 mph (72.42 km/h) | 46.79 mph (75.3 km/h) |
| 50 mph (80.47 km/h) | 51.99 mph (83.67 km/h) |
| 55 mph (88.51 km/h) | 57.19 mph (92.03 km/h) |
| 60 mph (96.56 km/h) | 62.39 mph (100.4 km/h) |
| 65 mph (104.61 km/h) | 67.58 mph (108.77 km/h) |
| 70 mph (112.65 km/h) | 72.78 mph (117.13 km/h) |
| 75 mph (120.7 km/h) | 77.98 mph (125.5 km/h) |
| 80 mph (128.75 km/h) | 83.18 mph (133.87 km/h) |
| 85 mph (136.79 km/h) | 88.38 mph (142.23 km/h) |
| 90 mph (144.84 km/h) | 93.58 mph (150.6 km/h) |
| 95 mph (152.89 km/h) | 98.78 mph (158.97 km/h) |
| 100 mph (160.93 km/h) | 103.98 mph (167.33 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1719 | 1997 | 2150 | 2246 | 2348 | 2421 | 2502 | 2597 | 2728 | 2860 | 3006 | 3123 | 3335 | 3570 | 3752 | 3869 | 3935 | 4177 | 4513 | 5245 |
Better Fuel Economy Factory Ratios Increased Power
