Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/25-21 | 275/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.41 (670.9) | 26.5 (673) | 0.08 (2.1) 0.3% |
| Width inches (mm) | 10.83 (275) | 10.83 (275) | 0 (0) 0% |
| Circum. inches (mm) | 82.98 (2107.69) | 83.24 (2114.29) | 0.26 (6.6) 0.3% |
| Sidewall Height inches (mm) | 2.71 (68.75) | 3.25 (82.5) | 0.54 (13.75) 20% |
| Revolutions per mile (km) | 763.56 (474.45) | 761.17 (472.97) | -2.38 (-1.48) -0.3% |
275/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.06 mph (32.29 km/h) |
| 25 mph (40.23 km/h) | 25.08 mph (40.36 km/h) |
| 30 mph (48.28 km/h) | 30.09 mph (48.43 km/h) |
| 35 mph (56.33 km/h) | 35.11 mph (56.5 km/h) |
| 40 mph (64.37 km/h) | 40.13 mph (64.58 km/h) |
| 45 mph (72.42 km/h) | 45.14 mph (72.65 km/h) |
| 50 mph (80.47 km/h) | 50.16 mph (80.72 km/h) |
| 55 mph (88.51 km/h) | 55.17 mph (88.79 km/h) |
| 60 mph (96.56 km/h) | 60.19 mph (96.86 km/h) |
| 65 mph (104.61 km/h) | 65.2 mph (104.93 km/h) |
| 70 mph (112.65 km/h) | 70.22 mph (113.01 km/h) |
| 75 mph (120.7 km/h) | 75.23 mph (121.08 km/h) |
| 80 mph (128.75 km/h) | 80.25 mph (129.15 km/h) |
| 85 mph (136.79 km/h) | 85.27 mph (137.22 km/h) |
| 90 mph (144.84 km/h) | 90.28 mph (145.29 km/h) |
| 95 mph (152.89 km/h) | 95.3 mph (153.37 km/h) |
| 100 mph (160.93 km/h) | 100.31 mph (161.44 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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