Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-21 | 245/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.04 (788.4) | 30.61 (777.5) | -0.43 (-10.9) -1.4% |
| Width inches (mm) | 10.04 (255) | 9.65 (245) | -0.39 (-10) -3.9% |
| Circum. inches (mm) | 97.51 (2476.83) | 96.16 (2442.59) | -1.35 (-34.24) -1.4% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 5.31 (134.75) | 0.29 (7.25) 5.7% |
| Revolutions per mile (km) | 649.76 (403.74) | 658.87 (409.4) | 9.11 (5.66) 1.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.72 mph (31.74 km/h) |
| 25 mph (40.23 km/h) | 24.65 mph (39.68 km/h) |
| 30 mph (48.28 km/h) | 29.59 mph (47.61 km/h) |
| 35 mph (56.33 km/h) | 34.52 mph (55.55 km/h) |
| 40 mph (64.37 km/h) | 39.45 mph (63.48 km/h) |
| 45 mph (72.42 km/h) | 44.38 mph (71.42 km/h) |
| 50 mph (80.47 km/h) | 49.31 mph (79.35 km/h) |
| 55 mph (88.51 km/h) | 54.24 mph (87.29 km/h) |
| 60 mph (96.56 km/h) | 59.17 mph (95.23 km/h) |
| 65 mph (104.61 km/h) | 64.1 mph (103.16 km/h) |
| 70 mph (112.65 km/h) | 69.03 mph (111.1 km/h) |
| 75 mph (120.7 km/h) | 73.96 mph (119.03 km/h) |
| 80 mph (128.75 km/h) | 78.89 mph (126.97 km/h) |
| 85 mph (136.79 km/h) | 83.82 mph (134.9 km/h) |
| 90 mph (144.84 km/h) | 88.76 mph (142.84 km/h) |
| 95 mph (152.89 km/h) | 93.69 mph (150.77 km/h) |
| 100 mph (160.93 km/h) | 98.62 mph (158.71 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1677 | 1948 | 2098 | 2190 | 2290 | 2362 | 2440 | 2533 | 2661 | 2790 | 2932 | 3047 | 3253 | 3482 | 3660 | 3774 | 3839 | 4074 | 4402 | 5116 |
Better Fuel Economy Factory Ratios Increased Power
