Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/25-20 | 255/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.41 (645.5) | 26.02 (661) | 0.61 (15.5) 2.4% |
| Width inches (mm) | 10.83 (275) | 10.04 (255) | -0.79 (-20) -7.3% |
| Circum. inches (mm) | 79.84 (2027.9) | 81.76 (2076.59) | 1.92 (48.69) 2.4% |
| Sidewall Height inches (mm) | 2.71 (68.75) | 3.01 (76.5) | 0.31 (7.75) 11.3% |
| Revolutions per mile (km) | 793.6 (493.12) | 774.99 (481.56) | -18.61 (-11.56) -2.3% |
255/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.48 mph (32.96 km/h) |
| 25 mph (40.23 km/h) | 25.6 mph (41.2 km/h) |
| 30 mph (48.28 km/h) | 30.72 mph (49.44 km/h) |
| 35 mph (56.33 km/h) | 35.84 mph (57.68 km/h) |
| 40 mph (64.37 km/h) | 40.96 mph (65.92 km/h) |
| 45 mph (72.42 km/h) | 46.08 mph (74.16 km/h) |
| 50 mph (80.47 km/h) | 51.2 mph (82.4 km/h) |
| 55 mph (88.51 km/h) | 56.32 mph (90.64 km/h) |
| 60 mph (96.56 km/h) | 61.44 mph (98.88 km/h) |
| 65 mph (104.61 km/h) | 66.56 mph (107.12 km/h) |
| 70 mph (112.65 km/h) | 71.68 mph (115.36 km/h) |
| 75 mph (120.7 km/h) | 76.8 mph (123.6 km/h) |
| 80 mph (128.75 km/h) | 81.92 mph (131.84 km/h) |
| 85 mph (136.79 km/h) | 87.04 mph (140.08 km/h) |
| 90 mph (144.84 km/h) | 92.16 mph (148.32 km/h) |
| 95 mph (152.89 km/h) | 97.28 mph (156.56 km/h) |
| 100 mph (160.93 km/h) | 102.4 mph (164.8 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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