Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/35-20 | 255/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 26.02 (661) | -0.18 (-4.5) -0.7% |
| Width inches (mm) | 8.86 (225) | 10.04 (255) | 1.18 (30) 13.3% |
| Circum. inches (mm) | 82.31 (2090.73) | 81.76 (2076.59) | -0.56 (-14.14) -0.7% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 3.01 (76.5) | -0.09 (-2.25) -2.9% |
| Revolutions per mile (km) | 769.75 (478.3) | 774.99 (481.56) | 5.24 (3.26) 0.7% |
255/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.86 mph (31.97 km/h) |
| 25 mph (40.23 km/h) | 24.83 mph (39.96 km/h) |
| 30 mph (48.28 km/h) | 29.8 mph (47.95 km/h) |
| 35 mph (56.33 km/h) | 34.76 mph (55.95 km/h) |
| 40 mph (64.37 km/h) | 39.73 mph (63.94 km/h) |
| 45 mph (72.42 km/h) | 44.7 mph (71.93 km/h) |
| 50 mph (80.47 km/h) | 49.66 mph (79.92 km/h) |
| 55 mph (88.51 km/h) | 54.63 mph (87.92 km/h) |
| 60 mph (96.56 km/h) | 59.59 mph (95.91 km/h) |
| 65 mph (104.61 km/h) | 64.56 mph (103.9 km/h) |
| 70 mph (112.65 km/h) | 69.53 mph (111.89 km/h) |
| 75 mph (120.7 km/h) | 74.49 mph (119.88 km/h) |
| 80 mph (128.75 km/h) | 79.46 mph (127.88 km/h) |
| 85 mph (136.79 km/h) | 84.43 mph (135.87 km/h) |
| 90 mph (144.84 km/h) | 89.39 mph (143.86 km/h) |
| 95 mph (152.89 km/h) | 94.36 mph (151.85 km/h) |
| 100 mph (160.93 km/h) | 99.32 mph (159.85 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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