Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 255/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 26.02 (661) | -1.96 (-49.9) -7% |
| Width inches (mm) | 13.98 (355) | 10.04 (255) | -3.94 (-100) -28.2% |
| Circum. inches (mm) | 87.93 (2233.36) | 81.76 (2076.59) | -6.17 (-156.77) -7% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 3.01 (76.5) | -0.48 (-12.25) -13.8% |
| Revolutions per mile (km) | 720.59 (447.76) | 774.99 (481.56) | 54.4 (33.8) 7.5% |
255/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.6 mph (29.93 km/h) |
| 25 mph (40.23 km/h) | 23.25 mph (37.41 km/h) |
| 30 mph (48.28 km/h) | 27.89 mph (44.89 km/h) |
| 35 mph (56.33 km/h) | 32.54 mph (52.37 km/h) |
| 40 mph (64.37 km/h) | 37.19 mph (59.86 km/h) |
| 45 mph (72.42 km/h) | 41.84 mph (67.34 km/h) |
| 50 mph (80.47 km/h) | 46.49 mph (74.82 km/h) |
| 55 mph (88.51 km/h) | 51.14 mph (82.3 km/h) |
| 60 mph (96.56 km/h) | 55.79 mph (89.78 km/h) |
| 65 mph (104.61 km/h) | 60.44 mph (97.26 km/h) |
| 70 mph (112.65 km/h) | 65.09 mph (104.75 km/h) |
| 75 mph (120.7 km/h) | 69.74 mph (112.23 km/h) |
| 80 mph (128.75 km/h) | 74.38 mph (119.71 km/h) |
| 85 mph (136.79 km/h) | 79.03 mph (127.19 km/h) |
| 90 mph (144.84 km/h) | 83.68 mph (134.67 km/h) |
| 95 mph (152.89 km/h) | 88.33 mph (142.16 km/h) |
| 100 mph (160.93 km/h) | 92.98 mph (149.64 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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