Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/50-21 | 275/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.83 (808.4) | 30.74 (780.9) | -1.08 (-27.5) -3.4% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 99.99 (2539.66) | 96.59 (2453.27) | -3.4 (-86.39) -3.4% |
| Sidewall Height inches (mm) | 5.41 (137.5) | 4.87 (123.75) | -0.54 (-13.75) -10% |
| Revolutions per mile (km) | 633.68 (393.75) | 656 (407.62) | 22.32 (13.87) 3.5% |
275/45-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.32 mph (31.09 km/h) |
| 25 mph (40.23 km/h) | 24.15 mph (38.87 km/h) |
| 30 mph (48.28 km/h) | 28.98 mph (46.64 km/h) |
| 35 mph (56.33 km/h) | 33.81 mph (54.41 km/h) |
| 40 mph (64.37 km/h) | 38.64 mph (62.18 km/h) |
| 45 mph (72.42 km/h) | 43.47 mph (69.96 km/h) |
| 50 mph (80.47 km/h) | 48.3 mph (77.73 km/h) |
| 55 mph (88.51 km/h) | 53.13 mph (85.5 km/h) |
| 60 mph (96.56 km/h) | 57.96 mph (93.28 km/h) |
| 65 mph (104.61 km/h) | 62.79 mph (101.05 km/h) |
| 70 mph (112.65 km/h) | 67.62 mph (108.82 km/h) |
| 75 mph (120.7 km/h) | 72.45 mph (116.6 km/h) |
| 80 mph (128.75 km/h) | 77.28 mph (124.37 km/h) |
| 85 mph (136.79 km/h) | 82.11 mph (132.14 km/h) |
| 90 mph (144.84 km/h) | 86.94 mph (139.91 km/h) |
| 95 mph (152.89 km/h) | 91.77 mph (147.69 km/h) |
| 100 mph (160.93 km/h) | 96.6 mph (155.46 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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