Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/30-20 | 255/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.08 (637) | 26.02 (661) | 0.94 (24) 3.8% |
| Width inches (mm) | 8.46 (215) | 10.04 (255) | 1.57 (40) 18.6% |
| Circum. inches (mm) | 78.79 (2001.19) | 81.76 (2076.59) | 2.97 (75.4) 3.8% |
| Sidewall Height inches (mm) | 2.54 (64.5) | 3.01 (76.5) | 0.47 (12) 18.6% |
| Revolutions per mile (km) | 804.19 (499.7) | 774.99 (481.56) | -29.2 (-18.14) -3.6% |
255/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.75 mph (33.4 km/h) |
| 25 mph (40.23 km/h) | 25.94 mph (41.75 km/h) |
| 30 mph (48.28 km/h) | 31.13 mph (50.1 km/h) |
| 35 mph (56.33 km/h) | 36.32 mph (58.45 km/h) |
| 40 mph (64.37 km/h) | 41.51 mph (66.8 km/h) |
| 45 mph (72.42 km/h) | 46.7 mph (75.15 km/h) |
| 50 mph (80.47 km/h) | 51.88 mph (83.5 km/h) |
| 55 mph (88.51 km/h) | 57.07 mph (91.85 km/h) |
| 60 mph (96.56 km/h) | 62.26 mph (100.2 km/h) |
| 65 mph (104.61 km/h) | 67.45 mph (108.55 km/h) |
| 70 mph (112.65 km/h) | 72.64 mph (116.9 km/h) |
| 75 mph (120.7 km/h) | 77.83 mph (125.25 km/h) |
| 80 mph (128.75 km/h) | 83.01 mph (133.6 km/h) |
| 85 mph (136.79 km/h) | 88.2 mph (141.95 km/h) |
| 90 mph (144.84 km/h) | 93.39 mph (150.3 km/h) |
| 95 mph (152.89 km/h) | 98.58 mph (158.65 km/h) |
| 100 mph (160.93 km/h) | 103.77 mph (167 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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