Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/55-21 | 275/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.91 (835.9) | 30.74 (780.9) | -2.17 (-55) -6.6% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 103.39 (2626.06) | 96.59 (2453.27) | -6.8 (-172.79) -6.6% |
| Sidewall Height inches (mm) | 5.95 (151.25) | 4.87 (123.75) | -1.08 (-27.5) -18.2% |
| Revolutions per mile (km) | 612.84 (380.8) | 656 (407.62) | 43.16 (26.82) 7% |
275/45-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.68 mph (30.07 km/h) |
| 25 mph (40.23 km/h) | 23.36 mph (37.59 km/h) |
| 30 mph (48.28 km/h) | 28.03 mph (45.1 km/h) |
| 35 mph (56.33 km/h) | 32.7 mph (52.62 km/h) |
| 40 mph (64.37 km/h) | 37.37 mph (60.14 km/h) |
| 45 mph (72.42 km/h) | 42.04 mph (67.66 km/h) |
| 50 mph (80.47 km/h) | 46.71 mph (75.17 km/h) |
| 55 mph (88.51 km/h) | 51.38 mph (82.69 km/h) |
| 60 mph (96.56 km/h) | 56.05 mph (90.21 km/h) |
| 65 mph (104.61 km/h) | 60.72 mph (97.72 km/h) |
| 70 mph (112.65 km/h) | 65.39 mph (105.24 km/h) |
| 75 mph (120.7 km/h) | 70.07 mph (112.76 km/h) |
| 80 mph (128.75 km/h) | 74.74 mph (120.28 km/h) |
| 85 mph (136.79 km/h) | 79.41 mph (127.79 km/h) |
| 90 mph (144.84 km/h) | 84.08 mph (135.31 km/h) |
| 95 mph (152.89 km/h) | 88.75 mph (142.83 km/h) |
| 100 mph (160.93 km/h) | 93.42 mph (150.35 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1669 | 1939 | 2089 | 2181 | 2280 | 2351 | 2430 | 2522 | 2650 | 2778 | 2920 | 3033 | 3239 | 3467 | 3644 | 3758 | 3822 | 4056 | 4383 | 5093 |
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