Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-21 | 245/50-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.97 (735.9) | 30.65 (778.4) | 1.67 (42.5) 5.8% |
| Width inches (mm) | 8.86 (225) | 9.65 (245) | 0.79 (20) 8.9% |
| Circum. inches (mm) | 91.02 (2311.9) | 96.28 (2445.42) | 5.26 (133.52) 5.8% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 4.82 (122.5) | 0.84 (21.25) 21% |
| Revolutions per mile (km) | 696.11 (432.54) | 658.11 (408.93) | -38.01 (-23.62) -5.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.16 mph (34.05 km/h) |
| 25 mph (40.23 km/h) | 26.44 mph (42.56 km/h) |
| 30 mph (48.28 km/h) | 31.73 mph (51.07 km/h) |
| 35 mph (56.33 km/h) | 37.02 mph (59.58 km/h) |
| 40 mph (64.37 km/h) | 42.31 mph (68.09 km/h) |
| 45 mph (72.42 km/h) | 47.6 mph (76.6 km/h) |
| 50 mph (80.47 km/h) | 52.89 mph (85.11 km/h) |
| 55 mph (88.51 km/h) | 58.18 mph (93.63 km/h) |
| 60 mph (96.56 km/h) | 63.47 mph (102.14 km/h) |
| 65 mph (104.61 km/h) | 68.75 mph (110.65 km/h) |
| 70 mph (112.65 km/h) | 74.04 mph (119.16 km/h) |
| 75 mph (120.7 km/h) | 79.33 mph (127.67 km/h) |
| 80 mph (128.75 km/h) | 84.62 mph (136.18 km/h) |
| 85 mph (136.79 km/h) | 89.91 mph (144.69 km/h) |
| 90 mph (144.84 km/h) | 95.2 mph (153.21 km/h) |
| 95 mph (152.89 km/h) | 100.49 mph (161.72 km/h) |
| 100 mph (160.93 km/h) | 105.78 mph (170.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1675 | 1946 | 2095 | 2188 | 2288 | 2359 | 2437 | 2530 | 2658 | 2787 | 2929 | 3043 | 3250 | 3478 | 3656 | 3770 | 3834 | 4069 | 4397 | 5110 |
Better Fuel Economy Factory Ratios Increased Power
