Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/45-21 | 270/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.74 (780.9) | 31.69 (805) | 0.95 (24.1) 3.1% |
| Width inches (mm) | 10.83 (275) | 10.63 (270) | -0.2 (-5) -1.8% |
| Circum. inches (mm) | 96.59 (2453.27) | 99.57 (2528.98) | 2.98 (75.71) 3.1% |
| Sidewall Height inches (mm) | 4.87 (123.75) | 5.85 (148.5) | 0.97 (24.75) 20% |
| Revolutions per mile (km) | 656 (407.62) | 636.36 (395.42) | -19.64 (-12.2) -3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.62 mph (33.18 km/h) |
| 25 mph (40.23 km/h) | 25.77 mph (41.48 km/h) |
| 30 mph (48.28 km/h) | 30.93 mph (49.77 km/h) |
| 35 mph (56.33 km/h) | 36.08 mph (58.07 km/h) |
| 40 mph (64.37 km/h) | 41.23 mph (66.36 km/h) |
| 45 mph (72.42 km/h) | 46.39 mph (74.66 km/h) |
| 50 mph (80.47 km/h) | 51.54 mph (82.95 km/h) |
| 55 mph (88.51 km/h) | 56.7 mph (91.25 km/h) |
| 60 mph (96.56 km/h) | 61.85 mph (99.54 km/h) |
| 65 mph (104.61 km/h) | 67.01 mph (107.84 km/h) |
| 70 mph (112.65 km/h) | 72.16 mph (116.13 km/h) |
| 75 mph (120.7 km/h) | 77.31 mph (124.43 km/h) |
| 80 mph (128.75 km/h) | 82.47 mph (132.72 km/h) |
| 85 mph (136.79 km/h) | 87.62 mph (141.02 km/h) |
| 90 mph (144.84 km/h) | 92.78 mph (149.31 km/h) |
| 95 mph (152.89 km/h) | 97.93 mph (157.61 km/h) |
| 100 mph (160.93 km/h) | 103.09 mph (165.9 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1619 | 1881 | 2026 | 2116 | 2212 | 2281 | 2357 | 2446 | 2570 | 2694 | 2832 | 2943 | 3142 | 3363 | 3535 | 3645 | 3707 | 3935 | 4252 | 4941 |
Better Fuel Economy Factory Ratios Increased Power
