Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-20 | 255/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673) | 26.02 (661) | -0.47 (-12) -1.8% |
| Width inches (mm) | 10.83 (275) | 10.04 (255) | -0.79 (-20) -7.3% |
| Circum. inches (mm) | 83.24 (2114.29) | 81.76 (2076.59) | -1.48 (-37.7) -1.8% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 3.01 (76.5) | -0.24 (-6) -7.3% |
| Revolutions per mile (km) | 761.17 (472.97) | 774.99 (481.56) | 13.82 (8.59) 1.8% |
255/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.64 mph (31.61 km/h) |
| 25 mph (40.23 km/h) | 24.55 mph (39.52 km/h) |
| 30 mph (48.28 km/h) | 29.47 mph (47.42 km/h) |
| 35 mph (56.33 km/h) | 34.38 mph (55.32 km/h) |
| 40 mph (64.37 km/h) | 39.29 mph (63.23 km/h) |
| 45 mph (72.42 km/h) | 44.2 mph (71.13 km/h) |
| 50 mph (80.47 km/h) | 49.11 mph (79.03 km/h) |
| 55 mph (88.51 km/h) | 54.02 mph (86.94 km/h) |
| 60 mph (96.56 km/h) | 58.93 mph (94.84 km/h) |
| 65 mph (104.61 km/h) | 63.84 mph (102.74 km/h) |
| 70 mph (112.65 km/h) | 68.75 mph (110.65 km/h) |
| 75 mph (120.7 km/h) | 73.66 mph (118.55 km/h) |
| 80 mph (128.75 km/h) | 78.57 mph (126.45 km/h) |
| 85 mph (136.79 km/h) | 83.48 mph (134.36 km/h) |
| 90 mph (144.84 km/h) | 88.4 mph (142.26 km/h) |
| 95 mph (152.89 km/h) | 93.31 mph (150.16 km/h) |
| 100 mph (160.93 km/h) | 98.22 mph (158.07 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1972 | 2291 | 2467 | 2576 | 2694 | 2778 | 2870 | 2979 | 3130 | 3281 | 3449 | 3584 | 3827 | 4095 | 4305 | 4440 | 4515 | 4792 | 5178 | 6017 |
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