Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-21 | 245/50-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.72 (729.4) | 30.65 (778.4) | 1.93 (49) 6.7% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 90.22 (2291.48) | 96.28 (2445.42) | 6.06 (153.94) 6.7% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.82 (122.5) | 0.96 (24.5) 25% |
| Revolutions per mile (km) | 702.32 (436.4) | 658.11 (408.93) | -44.21 (-27.47) -6.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.34 mph (34.35 km/h) |
| 25 mph (40.23 km/h) | 26.68 mph (42.94 km/h) |
| 30 mph (48.28 km/h) | 32.02 mph (51.52 km/h) |
| 35 mph (56.33 km/h) | 37.35 mph (60.11 km/h) |
| 40 mph (64.37 km/h) | 42.69 mph (68.7 km/h) |
| 45 mph (72.42 km/h) | 48.02 mph (77.29 km/h) |
| 50 mph (80.47 km/h) | 53.36 mph (85.87 km/h) |
| 55 mph (88.51 km/h) | 58.69 mph (94.46 km/h) |
| 60 mph (96.56 km/h) | 64.03 mph (103.05 km/h) |
| 65 mph (104.61 km/h) | 69.37 mph (111.63 km/h) |
| 70 mph (112.65 km/h) | 74.7 mph (120.22 km/h) |
| 75 mph (120.7 km/h) | 80.04 mph (128.81 km/h) |
| 80 mph (128.75 km/h) | 85.37 mph (137.4 km/h) |
| 85 mph (136.79 km/h) | 90.71 mph (145.98 km/h) |
| 90 mph (144.84 km/h) | 96.05 mph (154.57 km/h) |
| 95 mph (152.89 km/h) | 101.38 mph (163.16 km/h) |
| 100 mph (160.93 km/h) | 106.72 mph (171.75 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
