Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-21 | 275/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.5 (698.4) | 26.5 (673) | -1 (-25.4) -3.6% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 86.38 (2194.09) | 83.24 (2114.29) | -3.14 (-79.8) -3.6% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 3.25 (82.5) | 0 (0) 0% |
| Revolutions per mile (km) | 733.49 (455.77) | 761.17 (472.97) | 27.68 (17.2) 3.8% |
275/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.27 mph (31.02 km/h) |
| 25 mph (40.23 km/h) | 24.09 mph (38.77 km/h) |
| 30 mph (48.28 km/h) | 28.91 mph (46.52 km/h) |
| 35 mph (56.33 km/h) | 33.73 mph (54.28 km/h) |
| 40 mph (64.37 km/h) | 38.55 mph (62.03 km/h) |
| 45 mph (72.42 km/h) | 43.36 mph (69.79 km/h) |
| 50 mph (80.47 km/h) | 48.18 mph (77.54 km/h) |
| 55 mph (88.51 km/h) | 53 mph (85.29 km/h) |
| 60 mph (96.56 km/h) | 57.82 mph (93.05 km/h) |
| 65 mph (104.61 km/h) | 62.64 mph (100.8 km/h) |
| 70 mph (112.65 km/h) | 67.45 mph (108.56 km/h) |
| 75 mph (120.7 km/h) | 72.27 mph (116.31 km/h) |
| 80 mph (128.75 km/h) | 77.09 mph (124.07 km/h) |
| 85 mph (136.79 km/h) | 81.91 mph (131.82 km/h) |
| 90 mph (144.84 km/h) | 86.73 mph (139.57 km/h) |
| 95 mph (152.89 km/h) | 91.54 mph (147.33 km/h) |
| 100 mph (160.93 km/h) | 96.36 mph (155.08 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1937 | 2250 | 2423 | 2531 | 2646 | 2728 | 2819 | 2926 | 3075 | 3223 | 3388 | 3520 | 3759 | 4022 | 4229 | 4360 | 4435 | 4707 | 5086 | 5910 |
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