Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/55-20 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.21 (843.5) | 33.02 (838.72) | -0.19 (-4.78) -0.6% |
| Width inches (mm) | 12.01 (305) | 12.52 (318) | 0.51 (13) 4.3% |
| Circum. inches (mm) | 104.33 (2649.93) | 103.74 (2634.92) | -0.59 (-15.02) -0.6% |
| Sidewall Height inches (mm) | 6.6 (167.75) | 6.51 (165.36) | -0.09 (-2.39) -1.4% |
| Revolutions per mile (km) | 607.31 (377.37) | 610.78 (379.52) | 3.46 (2.15) 0.6% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.89 mph (32 km/h) |
| 25 mph (40.23 km/h) | 24.86 mph (40.01 km/h) |
| 30 mph (48.28 km/h) | 29.83 mph (48.01 km/h) |
| 35 mph (56.33 km/h) | 34.8 mph (56.01 km/h) |
| 40 mph (64.37 km/h) | 39.77 mph (64.01 km/h) |
| 45 mph (72.42 km/h) | 44.74 mph (72.01 km/h) |
| 50 mph (80.47 km/h) | 49.72 mph (80.01 km/h) |
| 55 mph (88.51 km/h) | 54.69 mph (88.01 km/h) |
| 60 mph (96.56 km/h) | 59.66 mph (96.01 km/h) |
| 65 mph (104.61 km/h) | 64.63 mph (104.01 km/h) |
| 70 mph (112.65 km/h) | 69.6 mph (112.02 km/h) |
| 75 mph (120.7 km/h) | 74.57 mph (120.02 km/h) |
| 80 mph (128.75 km/h) | 79.55 mph (128.02 km/h) |
| 85 mph (136.79 km/h) | 84.52 mph (136.02 km/h) |
| 90 mph (144.84 km/h) | 89.49 mph (144.02 km/h) |
| 95 mph (152.89 km/h) | 94.46 mph (152.02 km/h) |
| 100 mph (160.93 km/h) | 99.43 mph (160.02 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1554 | 1806 | 1945 | 2031 | 2123 | 2189 | 2262 | 2348 | 2467 | 2586 | 2718 | 2824 | 3016 | 3228 | 3393 | 3499 | 3558 | 3777 | 4081 | 4742 |
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