Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/45-21 | 275/55-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.74 (780.9) | 32.91 (835.9) | 2.17 (55) 7% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 96.59 (2453.27) | 103.39 (2626.06) | 6.8 (172.79) 7% |
| Sidewall Height inches (mm) | 4.87 (123.75) | 5.95 (151.25) | 1.08 (27.5) 22.2% |
| Revolutions per mile (km) | 656 (407.62) | 612.84 (380.8) | -43.16 (-26.82) -6.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.41 mph (34.45 km/h) |
| 25 mph (40.23 km/h) | 26.76 mph (43.07 km/h) |
| 30 mph (48.28 km/h) | 32.11 mph (51.68 km/h) |
| 35 mph (56.33 km/h) | 37.47 mph (60.29 km/h) |
| 40 mph (64.37 km/h) | 42.82 mph (68.91 km/h) |
| 45 mph (72.42 km/h) | 48.17 mph (77.52 km/h) |
| 50 mph (80.47 km/h) | 53.52 mph (86.13 km/h) |
| 55 mph (88.51 km/h) | 58.87 mph (94.75 km/h) |
| 60 mph (96.56 km/h) | 64.23 mph (103.36 km/h) |
| 65 mph (104.61 km/h) | 69.58 mph (111.98 km/h) |
| 70 mph (112.65 km/h) | 74.93 mph (120.59 km/h) |
| 75 mph (120.7 km/h) | 80.28 mph (129.2 km/h) |
| 80 mph (128.75 km/h) | 85.63 mph (137.82 km/h) |
| 85 mph (136.79 km/h) | 90.99 mph (146.43 km/h) |
| 90 mph (144.84 km/h) | 96.34 mph (155.04 km/h) |
| 95 mph (152.89 km/h) | 101.69 mph (163.66 km/h) |
| 100 mph (160.93 km/h) | 107.04 mph (172.27 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1560 | 1812 | 1951 | 2037 | 2130 | 2197 | 2270 | 2356 | 2475 | 2595 | 2728 | 2834 | 3026 | 3239 | 3404 | 3511 | 3570 | 3789 | 4095 | 4758 |
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