Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/45-20 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.1 (764.5) | 33.02 (838.72) | 2.92 (74.22) 9.7% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) 11.6% |
| Circum. inches (mm) | 94.56 (2401.75) | 103.74 (2634.92) | 9.18 (233.17) 9.7% |
| Sidewall Height inches (mm) | 5.05 (128.25) | 6.51 (165.36) | 1.46 (37.11) 28.9% |
| Revolutions per mile (km) | 670.07 (416.36) | 610.78 (379.52) | -59.3 (-36.84) -8.8% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.94 mph (35.31 km/h) |
| 25 mph (40.23 km/h) | 27.43 mph (44.14 km/h) |
| 30 mph (48.28 km/h) | 32.91 mph (52.97 km/h) |
| 35 mph (56.33 km/h) | 38.4 mph (61.8 km/h) |
| 40 mph (64.37 km/h) | 43.88 mph (70.62 km/h) |
| 45 mph (72.42 km/h) | 49.37 mph (79.45 km/h) |
| 50 mph (80.47 km/h) | 54.85 mph (88.28 km/h) |
| 55 mph (88.51 km/h) | 60.34 mph (97.11 km/h) |
| 60 mph (96.56 km/h) | 65.82 mph (105.94 km/h) |
| 65 mph (104.61 km/h) | 71.31 mph (114.76 km/h) |
| 70 mph (112.65 km/h) | 76.8 mph (123.59 km/h) |
| 75 mph (120.7 km/h) | 82.28 mph (132.42 km/h) |
| 80 mph (128.75 km/h) | 87.77 mph (141.25 km/h) |
| 85 mph (136.79 km/h) | 93.25 mph (150.07 km/h) |
| 90 mph (144.84 km/h) | 98.74 mph (158.9 km/h) |
| 95 mph (152.89 km/h) | 104.22 mph (167.73 km/h) |
| 100 mph (160.93 km/h) | 109.71 mph (176.56 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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