Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 275/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 26.5 (673) | -1.49 (-37.9) -5.3% |
| Width inches (mm) | 13.98 (355) | 10.83 (275) | -3.15 (-80) -22.5% |
| Circum. inches (mm) | 87.93 (2233.36) | 83.24 (2114.29) | -4.69 (-119.07) -5.3% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 3.25 (82.5) | -0.25 (-6.25) -7% |
| Revolutions per mile (km) | 720.59 (447.76) | 761.17 (472.97) | 40.58 (25.22) 5.6% |
275/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.93 mph (30.47 km/h) |
| 25 mph (40.23 km/h) | 23.67 mph (38.09 km/h) |
| 30 mph (48.28 km/h) | 28.4 mph (45.71 km/h) |
| 35 mph (56.33 km/h) | 33.13 mph (53.32 km/h) |
| 40 mph (64.37 km/h) | 37.87 mph (60.94 km/h) |
| 45 mph (72.42 km/h) | 42.6 mph (68.56 km/h) |
| 50 mph (80.47 km/h) | 47.33 mph (76.18 km/h) |
| 55 mph (88.51 km/h) | 52.07 mph (83.8 km/h) |
| 60 mph (96.56 km/h) | 56.8 mph (91.41 km/h) |
| 65 mph (104.61 km/h) | 61.53 mph (99.03 km/h) |
| 70 mph (112.65 km/h) | 66.27 mph (106.65 km/h) |
| 75 mph (120.7 km/h) | 71 mph (114.27 km/h) |
| 80 mph (128.75 km/h) | 75.73 mph (121.88 km/h) |
| 85 mph (136.79 km/h) | 80.47 mph (129.5 km/h) |
| 90 mph (144.84 km/h) | 85.2 mph (137.12 km/h) |
| 95 mph (152.89 km/h) | 89.94 mph (144.74 km/h) |
| 100 mph (160.93 km/h) | 94.67 mph (152.35 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1937 | 2250 | 2423 | 2531 | 2646 | 2728 | 2819 | 2926 | 3075 | 3223 | 3388 | 3520 | 3759 | 4022 | 4229 | 4360 | 4435 | 4707 | 5086 | 5910 |
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